An enemy of Mr. Frost, desiring revenge, reads of the death of Mr. and Mrs. Marvell, his daughter and son-in-law. Mr. Frost adopts the little girl and requires a nurse. His enemy sends a woman accomplice who secures the position. The grandparents treat the nurse so well that she refuses to be a party to the plot. Frost decides to send his family to Europe. His automobile is tampered with, and the party hires a taxicab--which is run by one of the gang. The chauffeur's actions arouse Frost's suspicions. He quickly repairs his own auto and follows. Instead of being taken to the steamer his family is being taken as prisoners to a lonely house. Frost arrives and rescues them and the chauffeur flees. On board the ship the family meet Lambert Chase, a detective. One day on the boat the little girl disappears. Her folks consult the detective and he laughingly takes them to where he has wrapped her up warmly in a large steamer rug.