Why was accountant Howard Armstrong murdered when he was leaving his office one afternoon?
After her husband is gunned down by an unknown assailant, his traumatized widow, Karen, is left to bring up three children on her own. The shock of his death is intensified when she discovers that Howard had been leading a secret life of which she was totally unaware. Devastated by the revelations emerging from the murder enquiry, she is determined to keep her children from learning the terrible truth about their father. To escape gossip and press intrusion, she takes them on a short trip to Wales.
On their return, she sinks into depression and is persuaded by a friend to undergo psychotherapy. The police announce that they have arrested a suspect, but it is Karen herself who finds a vital clue leading to the discovery of the identity of Howard's real murderer.