Our Little Secret

 is an unmarked quest in Fallout 3.

Brief walkthrough
Directly south of Fairfax Ruins is the small town of Andale. Discover through dialogue and exploration that the inhabitants are cannibals. Choose to either accept their behavior and keep their secret or reject their behavior and kill the adults of the town.

There is no reward for this quest other than some loot from the buildings.

Detailed walkthrough
Talk to Old Man Harris, who will warn you to get away from the town. After talking to Harris, head to the abandoned shack or the basement of the Smith household.
 * Both doors require 100 lockpick skill (Picking either lock will give you negative karma.)
 * It is possible to get the keys by pickpocketing the male adults. (Bill Wilson or Jack Smith). Because they are evil, you will not lose karma.
 * There are also keys in Smith and Wilson's house on the nightstand next to the queen size bed. You will get negative karma for stealing them.
 * There is a second key in the Wilson's house on top of the radio in the living room; you'll get negative karma for stealing it.

Upon proceeding into the area, the player can look around and discover that "strange meat" really is human flesh.

Upon exiting the area, the player will be confronted by the residents of the town, with the exceptions of Junior, Jenny, and old man Harris. Jack Smith will engage the player in conversation and ask if he/she saw anything unusual. If you do not go to old man Harris first, and lockpick the door during the day, they will immediately attack you.

There are two speech checks in the dialogue tree. The first speech check option is to tell them that you thought about "getting a snack." Having the Cannibal perk changes this to a guaranteed success. If you choose to initially play coy by not answering straight, you will get another, easier speech check in the form of passive acceptance of their behavior (though this option will cause unintended issues). If you are successful at either speech check, in essence insisting that you did not see anything wrong and agree to keep their secret, the townsfolk will be kind to the player and you will be able to receive a free strange meat pie daily from Linda Smith.

On the other hand, if the player refuses to keep the secret, the residents will become hostile and attempt to murder the player, forcing you to kill them all. Afterwards, the player can proceed to old man Harris' house. He will then tell more of the town's history and will agree to help raise the kids right. He states that only after his wife died did he begin to question all the things that went on in Andale, and also that not only was it a town of cannibals, but a town of inbred cannibals.

Bugs

 * If you non-violently resolve the confrontation by selecting the line "Sure, Jack. No problem at all. I saw nothing." without having the Cannibal perk the four parents will stand with their weapons drawn outside of either the shed or the house with a basement, forever, the kids will disappear, and old man Harris' house is key-locked. Even though they're stuck you will still be able to get a daily strange meat pie from Linda Smith.
 * Arriving at Andale, you may encounter the families already gathered in front of the Smith house with their weapons drawn. Mr Smith confronts the player as if they have already been in the basement. If you choose to fight, you can loot the house and shed key from the corpses without karma penalty.
 * After exiting the shed, Jack Smith will engage in dialogue with you, but it will be as if you have already negotiated with him. This means his dialogue options will be "What's wrong with that Harris guy?" etc.
 * It's possible that upon leaving the basement the adults are waiting with their weapons drawn in front of the shed as if you just came out of there. After waiting a few minutes they will slowly make their way to the Smith's house and dialogue will proceed as normal if you approach them.

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