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Paul Gregory, a Canadian confidence trickster operating in London, targets a wealthy Canadian woman in Britain to sell her collection of valuable coins. After meeting her at an ice hockey match, he sets about winning her confidence until she is prepared to give him legal control over the sale. He completes the deal without her knowledge, puts the money from the sale in a safe deposit box, and then deliberately waits to be caught by the police. Gregory plans on getting a five-year sentence, with time off for good behaviour, and then collecting his loot when he is released.
However, the judge makes an example of the uncooperative Gregory by handing down a ten-year term. Not wishing to spend so much time in jail, Gregory pays Victor Sloane, one of his associates on the outside, to help him escape. Almost immediately, things begin to go wrong. Fearing arrest, he is unable for the moment to recover the money from the safe. Sloane also now begins to demand more money, threatening him with violence, and Gregory is forced to retaliate.
Gregory tries to get help from his fellow criminals, calling upon an established code that exists between them. But when his former associate Sloane is found dead – accidentally having choked to death on the gag Gregory placed in his mouth – they refuse to offer him any assistance, as he is now too "hot".
With the manhunt rapidly closing in, he tries to escape with the help of Bridget Howard, a disillusioned ex-débutante and niece of a Chief Constable. She drives Gregory to a deserted cottage near her family's home in rural Wales. While in hiding, he witnesses the police arrive to question Bridget, assumes the worst, and flees again. Attempting to steal a farmer's bicycle, he is shot in the shoulder. He drives away in a stolen truck but crashes and passes out, where he is found by another farmer. Bridget tells the police nothing. She waits in vain for Gregory at the cottage, then walks into the distance.

ten-year