As they travel by ship to New York for her childhood friend Tabitha's wedding, Amory Ames gazes out at the city's iconic skyline, excited by the prospect of being a bridesmaid. Her husband Milo, however, is convinced their trip will be deadly dull, since Prohibition is in full swing. But when a member of the wedding party is found murdered on the front steps of the bride's home, the happy plans take a darker twist. Amory discovers that the dead groomsman...

Amory Ames is contentedly preparing for the arrival of her baby at Thornecrest while Milo, her husband, is away on business. But then a woman appears on her doorstep, also claiming to be Mrs Ames, Milo's wife. Amory's marriage has had its ups and downs, but her faith in Milo has been restored. Though the supposed second Mrs. Ames seems earnest, Amory is convinced she must be mistaken. However, when a second unexpected visitor arrives, and secret identities...