The Cop (1928)

Pete Smith a lift bridge operator in a harbor feels lonely in his cabin his only visitor being a policeman on patrol Sgt Coughlin One night after hearing shots Smith gives shelter to a wounded man whom he hides from Coughlin Before leaving the man Marcas promises to return the favor and the coat he borrows from him Later Smith enters the police and his chief Mather suspects he is protecting Marcas who is actually a gangster Marcas sends a girl Mary Monks to deliver a luxurious coat with a fur collar to Smith Pete and Mary get along well and for his sake she betrays Marcas who is eventually shot to death by the cops after having stopped his mob from killing Smith Mary goes away alone into the night and when Mather finds out that Pete is protecting her he drops away the evidence of her presence on the spot