 Steve McQueen plays the role of a no glitter, all guts cop named Frank Bullitt. He and two other cops are assigned to what seems like a normal case : to watch a witness for 48 hours before he goes to trial on Monday. When the officers and the witness are killed, Chalmers gets angry at Bullitt. After he chases the hitman that killed them, he vows to catch him, and the mafia boss that hired him.