A distinguished English gentleman has a secret life--he is the notorious jewel thief the press has dubbed "The Amateur Cracksman". When he meets a woman and falls in love he decides to "retire" from that life, but an old friend comes to him with a predicament that entails him committing one last job.

Stranded and broke after her erstwhile boyfriend leaves her, A onetime London heiress joins a con man to bilk a millionaire at his Italian villa. Little do they realize that he knows full well who they are after being tipped off by Scotland Yard.