How Little We Know

 is a quest in Fallout: New Vegas.

Quick walkthrough
In this quest you can choose whether or not to help Cachino end the reign of the former bosses of the Omertas.

Note that helping Cachino will reveal the full extent of the plans (Speech Check of 80 needed), while helping the bosses instead will not.

Detailed walkthrough
This quest is activated after talking to Yes Man or once Bye Bye Love is complete. Inside the main entrance to the Gomorrah, talk to receptionist on your left. If it appears as a speech option, ask her about "the outstanding balance" on information to find out what's been going on in Gomorrah. She will tell you to find Cachino, a low level lieutenant, and ask him about suspicious Omerta activities. If there is no "outstanding balance" speech option with the receptionist, ask a few of the dealers/bouncers/hookers about where you can find Cachino. They will all tell you to go away, but eventually Cachino will appear on the casino floor and talk to you. If you have the Terrifying Presence perk you get a new speech option and they'll tell you to meet him in Brimestone. Another way to start this quest is as part of For the Republic, Part 2, you will be asked to get some information regarding the Omertas by Colonel Moore. She will then tell the PC to talk to Liza O'Malley to start this quest. This quest can also be given by Mick after asking him for work and he tells you that the Omertas have stopped buying guns from him

You need to find proof of Cachino's work he's been doing on the side that the Omertas don't know about to get him to talk. There is a journal in his desk in his room with evidence and another on his person that can be pick pocketed, his desk will be the one directly to your left as soon as you walk in his room. You can get the key from the receptionist for 300 caps or either a Strength check of 8 (making it free of charge) or a Barter skill check of 55 (lowering the bribe to 200 caps). Once you return to Cachino and tell him you have his journal, he will offer you 100 caps to get the journal back, or if you have Barter of 60 you can get an additional 200 caps for his "friendship." He tells you about two people in the club that were brought in by the bosses as part of their plans, but doesnt know much about it, he tells you to talk to Clanden and Troike about specifics.

Clanden will not give you any clues or talk with you about what he does at all, even if you mention that Cachino sent you. If you go back and speak to Cachino, he'll mention he did some asking around and the bosses plans would be screwed if Clanden wasn't around, so he asks you to kill Clanden discreetly. Alternatively you may steal Clanden's key off him which opens a safe hidden behind a cabinet next to his bed, the evidence within will allow you to confront him. Clanden will turn hostile as soon as he sees you draw a gun. Once you take care of him, report back to Cachino. Note: Killing Clanden before you are instructed to will result in failure of the quest but the player still receives the same rewards (positive karma, experience, etc.). If Cachino is killed by the player (or a companion) the same is true.

There's a hidden safe behind the wardrobe next to the bed in Clandens room. The lock can be picked or the key can be pickpocketed off Clanden. Taking the films back to Cachino will result in him telling you to confront Clanden with the tapes and blackmail him into either leaving Vegas or helping you. Confronting Clanden can result in him becoming hostile and attacking. The key gained from pickpocketing Clanden can also be used to open one of the maintenance rooms on the suite level, where a dead hooker can be found (which you can investigate), which proves Clanden's shady dealings. The tapes can also be used to make Claden leave or pay you to never mention them (barter check)

When you speak to Troike, start asking about the dead hooker, if you have the Medicine skill at 30 you can say that the story about him blacking out doesn't add up. The player can find evidence that there was foul play by looking for evidence (such as a blackmail note in Big Sal's office safe that proves the bosses set Troike up). Alternatively, you can talk to Big Sal and convince him to free Troike from his contract with a high enough speech or barter skill, this allows troike to be freed without having to investigate the dead hooker incident or find any evidence. If you have a speech skill of 80 you can lie to Troike and tell him you'll tell the NCR of his dealing, bypassing the hooker investigation and talking to Big Sal.

Once Troike has been freed of his contract, he will cooperate and tell you about his involvement with the Omertas. He'll tell you he was smuggling guns in through the NCR supply shipments, and you can discuss destroying the guns. He'll give you some thermite and a key to destroy the guns the Omertas have been gathering for their secret plans, or if your speech is high enough you can convince him to plant the thermite himself. The guns are behind a unique door in the hotel, look for two flamers, a sniper rifle, and two carbines (these will help later in the next part of the quest). Place the thermite on the guns and set off the detonator via the panel near the closest door to the room. If Troike plants the thermite himself he will get caught and rat you out before the Omertas kill him, but this won't ruin any of your objectives.

After you speak to Cachino about completing both objectives, he'll tell you the bosses need to be killed now. Luckily, they just put him in charge of finding out who's responsible for ruining their plans, and he'll lead you to a small room where the two bosses are. It is possible to convince Cachino to wait for your signal and he'll start shooting first with a speech of 80. If you didn't get the guns from the room when you used the thermite you can use the Sawed-off shotgun Cachino gives you to kill the bosses, or you could use the holdout weapons you smuggled into the casino. They'll ask you to have a seat, and the conversation will begin. They talk about how they know you've been ruining their plans and they want to kill you. At any point in the conversation you can start combat through a dialogue option, but it is possible with a speech of 80 to have Big Sal explain the whole plan to you, and you can convince Big Sal that Nero was helping you, and he'll start shooting Nero when combat starts. If you do this, Big Sal and Cachino will likely die very fast, but if you want to avoid combat, you can quickly loot the office key from Sal and run outside. The various Omerta Thugs in the casino will kindly assist you with killing Nero.

Once the bosses are dead the quest is complete and Cachino will take over the casino, if you speak to him after the fight he'll offer you 50 Gomorrah tokens as thanks, each time you speak to him.

Alternative Solution
If you inform the guard at the door to the Zoara Club that you have proof that one of their guys is dealing on the side, he will let you in to see the bosses. You can talk to Big Sal and offer him the journal for 100 caps or 200 caps if you succeed in a speech check. After that, Cachino is brought into Big Sal's office for a meeting where Button Man will shoot him. Talk to Big Sal afterwards to take over for Cachino. Big Sal will offer you a job aiding Clanden and Troike in their plans.

For Clanden, it means helping him kill "A large amount of people in a short amount of time", aka making bombs. If you have a high enough Science skill (60) you can figure you need to make a chlorine bomb, otherwise Clanden will tell you that's what is needed. The chlorine can be stolen from the Ultra-Luxe casino. Troike will tell you that he is a gun smuggler and will inform you that he needs someone to retrieve a crate of guns stolen by the Fiends. Their location will be marked on you map. There are only three Fiends guarding a Crate of Stolen Weapons.

Return the chlorine to Clanden and the guns to Troike to update the mission. You will then be told to see Big Sal. Upon informing Big Sal of your having fulfilled his request to aid Clanden and Troike, he awards you 400 caps. You can also speak to him about gambling for 50 tokens.

Bugs
When speaking to Cachino before going to kill the bosses, selecting the "Wait" and "Ready" dialogue options may prevent Cachino from further interacting with the player. When trying to re-initiate dialogue, Cachino will only respond that 'there is no time to talk' meaning the player cannot tell him they are ready to go; and he will also remain in place and not lead the player to the meeting with the bosses preventing further progress in the quest including completion. Leaving Cachino there and attempting to finish to quest later will revert Cachino to previous lines of dialogue in which you can only ask about the bosses' plans, Troike, and Clanden. To note, this quest was undertaken before initiating or completing Bye Bye Love as the walkthrough indicates is necessary. It is unknown if this is related to the glitch. (Update, 360): Completing Bye Bye Love does not unlock communication with Cachino. ** This bug can be bypassed, by simply finding the small office where the meeting would take place (next to Big Sal's office on the main floor) and killing the bosses, resulting in a quest complete message, regardless of Cachino following you there. **

When Cachino is supposed to give you the double-barreled shotgun, it may end up in your companions inventory instead of yours. This can occur even if Cachino is still bugged as previously mentioned.

Sometimes, after unlocking the Very Hard locked door in which the Dead prostitute is located, she will get off the table as if sleeping. She will then use the default prostitute dialogue. Not quest-breaking as the dialogue concerning the prostitute occurs with Troike where there are other options for getting him to cooperate.

If you steal Sal and Nero's ammo before sitting down for your chat, choosing the lie option implicating Nero will cause the two of them to stare at one another with guns out, but they will not attack due to lack of ammo.

If you accidentally start a fight with the body guards or security, then leave the Casino to The Strip, when you re-enter the casino the game freezes; your character is unable to move just look around.

The dead prostitute you can inspect during the How Little We Know quest can be found alive and standing after the quest is complete. If you examine her the box telling you to inspect her will still pop up.

If you find and inspect the dead prostitute before the quest, she may be found alive during the quest. She can still be inspected, so the bug does not affect the quest.

If you receive the key from the receptionist, you can lift the book off Cachino AND head up to his room to get another copy of his journal. Sell the first one with the Barter check then talk to him again for the 100 caps and intel on the Family's activities option.

If you were previously banned from gambling at Gomorrah, you will still receive chips as a reward, even though you remain banned.

After receiving the option from Cachino to kill Clandon - occasionally killing Clandon will result in a failed mission. In this play through, Troike set off the thermite and didn't know he was exonerated... unknown if this triggered the bug.

After completing the mission, without going into Clandens room with the dead hookers body, going into Clandens room via his room key, the hooker may be alive. You cannot interact with her but only examine her body, which is glitched because she is not dead.