We'll lock you both up in the same jail cell... a tough one... the sort of place that gives kindly old ladies the shivers.At one of France's toughest prisons, an undercover cop is attempting to trap an enemy spy by posing as a fellow inmate. So Frank and Hal find themselves holed up together in a grimy, rat-infested cell, each warily eyeing the other. As they plan a daring escape, an unexpected friendship ensues - but which is the cop and which is the spy?