Former NYPD Cold Case Squad Deputy Inspector Vito Spano and Stacy Horn, a contributor to NPR’s "All Things Considered," share true-crime stories about what it’s really like to work as a homicide detective. In New York, these detectives are faced with thousands of unsolved murders. And in The Restless Sleep, Ms. Horn reveals how detectives try to crack cases that occurred 10, 20, or even 50 years ago.

» Read an excerpt of The Restless Sleep in the Reading Room

Music: “Heat” soundctrack, tracks “Heat’ by Kronos Quartet and “Always Forever Now” by Passengers