It's just days before Christmas in London, but not everyone is full of good cheer - as a maniac with a pathological hatred of Santa Claus stalks the streets, butchering any man that’s unlucky enough to be wandering around dressed as Old Saint Nick.
Ten people are invited to go on an African safari, only to find that an unseen person is killing them one by one. Could one of them be the killer?
Dr. Arthur Calgary visits the Argyle family to return an address book lost some time ago by Jack Argyle, only to find out that Jack has been executed for the murder of his mother. Calgary can prove that Jack was innocent. In spite of opposition from a hostile family, he is determined to solve the crime.
