The year is 1921. A passionate affair between voracious romance reader Alma Webster and her dentist, Walter Baranov, has led to his wife’s murder. The lovers take flight aboard the Mauretania and the dentist takes the name of Inspector Dew, the detective who arrested the notorious wifekiller Dr. Crippen. But, in a disquieting twist, a murder occurs aboard ship and the captain invites “Inspector Dew” to investigate.