The setup for "It Takes A Thief" really doesn't make a lot of sense--and that is a huge problem. It begins with Jim (Anthony Quayle) falling for Billy (Jayne Mansfield). He doesn't realize that Billy is a cold and calculating sort--and she is setting him up. She convinces him to join in on a heist and he agrees. Now here is the part that makes no sense at all--Jim is responsible for hiding the money and then someone in the gang lets the cops know he was in on the crime and he's sent to prison. Why turn Jim in to the police? Jim would either return the money to the authorities OR he'd sit on it until after he's out of prison--and that could be years. It simply makes little sense. And for some time you aren't sure if Billy did this or perhaps Kristy--the brooding gang member who appears to have an extremely close relationship with Billy.
Regardless, several years pass and Jim has now done his time--and the money is still hidden. He has no intention of returning to his life of crime--even though the old gang is pressuring him to do so because they want the loot. When he refuses to cooperate with them, the gang turns up the pressure by kidnapping Jim's son. At the same time, the police are keeping an eye on Jim because they, too, want the money as well. With all this pressure on him, what is he to do?
Aside from a main plot idea that makes little sense, "It Takes a Thief" has several other things working against it. The big one is the odd casting of Mansfield considering the film is set in England. Plus, the pairing of the distinguished actor, Anthony Quayle with Jayne Mansfield is just plain weird. Finally, the DVD print is pretty bad--making the viewing experience less than stellar. It's really sad because apart from the weird casting strange plot about Jim being turned it, it's a very good noir sort of film. The film has a lot of tension and the scenes involving the search for the kid late in the film were awfully good.