Helen Ferguson, pregnant, penniless and dumped by her boyfriend Steve Morley, takes the identity of the pregnant Patrice Harkness, when she and her husband are killed in a train crash. The rich Harkness in-laws, and their other son Bill, had never seen Patrice, so they accept her and her newborn son 被开发过和没开发怎么看出into their family. However Steve eventually finds her and starts to blackmail her.