Shield for Murder

Lieutenant Barney Nolan (Edmond O'Brien), a 16-year veteran of the police force, has had it with the world he inhabits. In a secluded alley late one night, he fatally shoots a bookmaker in the back and steals the $25,000 the man has on him. He then claims he had been forced to kill the man because he tried to escape custody. Sergeant Mark Brewster (John Agar), his friend and protégé, believes him, as does the Captain of Detectives, Captain Gunnarson (Emile Meyer). However, newspaper reporter Cabot (Herbert Butterfield) suspects otherwise.