Detective Case Files

Detective Case Files is a quest in Fallout 4.

Quick walkthrough

 * Head to Nick Valentine's Detective Agency.
 * Talk to Ellie Perkins.
 * Accept her request in solving some cases.
 * One will acquire the Earl Sterling Case File and the Marty Bullfinch’s Holotape. Picking up the former will start the side quest "The Disappearing Act", while listening to the latter will start "The Gilded Grasshopper."

The Disappearing Act
You begin quest by reading the case file on the table. You can optionally ask about the Earl Sterling but its not neccessary. When you ask Vadim Bobrov about the Earl Sterling, he will give you the keys to his house, letting you look arround. You can find a surgery receipt on the floor, next to the sofa. This will lead you to the Doctor Crocker surgery center in Diamond City. Interrogating the Dr. Sun, you can ask about the bloodstains on the floor leading to cellar. If the interrogation will be succesfull he will give you the keys to the cellar. Entering the cellar you can see Doctor Crocker speaking with the corpse of Earl Sterling, talking about how he shouldnt bleed during the surgery. Noticing you, Doctor Crocker tells you that surgery went bad and you that he is high on Jet. Either you choose to kill him, arrest him or let him go, he will kill himself in either way, injecting his body with lethal dose of Psycho. Few seconds after that, Dr. Sun goes down to cellar to discover what really happened. You explain to him that operation went badly and Doctor Crocker wanted to hide the body in the cellar.