Fred Martin, a taxi driver who is a reformed convict, is used by the police to go undercover in order to help catch a gang of safe robbers. However things start to go wrong when the police stake out the wrong bank and Fred finds himself alone with the crooks.

Fred Martin, a taxi driver who is a reformed convict, is used by the police to go undercover in order to help catch a gang of safe robbers. However things start to go wrong when the police stake out the wrong bank and Fred finds himself alone with the crooks.