After you kill Northy, or more accurately, he seems to kill himself, you're supposed to check the body for clues. With the Silver Shroud missions you have to toss a calling card onto the character's body after you kill them to register as complete."Search body for clues" may not check off after searching Northy's body leaving the player character with a quest blip over his body. After I killed Northy I checked his body for clues and listened to the tape. Use VATS to take him out. Be sure to leave calling cards on both of their corpses. Dogmeat is incredibly useful for this situation, as he can be told to search for a weapon and he'll fetch the Firelance. Hello, my name is Alex Christ, and I'm going to spend the next four hours with you talking about clinical preventive medicine, and this is a big topic. I've killed Northy in the silver shroud quest and must search the body. There is a marker on a pile of rubble, but I don't see any way to get under.