Dear detective holotapes

 are a series of four holotapes in Fallout 4.

Locations

 * 1; Found on a cabinet immediately after entering Fens Street sewer.
 * 2; Found on a grill (along with a skull and some arm bones) after going past the catwalk in the first hallway of Fens Street sewer.
 * 3; Found after going across the bridge in the room full of baby carriages in Fens Street sewer; it is on the end table beside an easy chair.
 * 4; Found in the generator room of Fens Street sewer, behind a security gate in the southwest corner. The holotape is on a cabinet.