Homicide: A Year on the Killing Streets by David Simon is a non-fiction book that chronicles a year in the life of the Baltimore Police Department’s Homicide Unit. The book is based on the author’s observations and interviews as a reporter for The Baltimore Sun, who gained unprecedented access to the unit in 1988. The book covers various cases, characters, and themes related to the work of homicide detectives, such as violence, justice, race, and bureaucracy.