The Sleeping City (1950)

A young doctor taking a break from work is shot in the head, and the police can't find a clue even as to a possible motive. Inspector Al Gordon (John Alexander) decides that he has to put some men on duty at the hospital, and one of them is Fred Rowan (Richard Conte), a detective with experience as an army medic, masquerading as an intern. What Rowan finds is a high-pressure world in which interns are hopelessly squeezed for time, sleep, energy, and -- most of all -- money, and walk a fine line on the edge of personal and professional disaster.