Suspicion.

Johnnie Aysgarth (Cary Grant) meets dowdy Lina McLaidlaw (Joan Fontaine) on a train in England and charms her into eloping. After a lavish honeymoon and returning to an extravagant house, Lina discovers that Johnnie has no job and no income, habitually lives on borrowed money, and was intending to try to sponge off her father. She talks him into getting a job, and he goes to work for his cousin, Captain Melbeck. Lina learns that he has continued to gamble wildly, despite promising to quit, and that to pay a gambling debt,