David Fielding, who has recently lost his wife, moves into a new neighborhood under a cloud of suspicion. Many feel that his wife's death in a car crash was no accident. Elizabeth Howard, the governess he hires to look after his children, makes it her mission to find out the truth. When other murders seem to be following David to his new town, Elizabeth investigates with the help of David's son Barnaby.

A scheming wife lures an insurance investigator into helping murder her husband and then declare it an accident. The investigator's boss, not knowing his man is involved in it, suspects murder and sets out to prove it.