etective Murdoch investigates a series of deaths in which the killer severs the victims' right thumb. The murders have all occurred in quick succession and are somehow related to the racing sheet for the 7th race at Woodbine - only there is no 7th race. There are very few clues for them to go on and Murdoch soon realizes that he has been added to the list of possible victims. Constable Crabtree meanwhile is crushed by the unexpected return of Edna's husband, who everyone thought was dead. His feelings aside, he is outraged when he realizes that the man has beaten her. When Edna's husband is found dead, all of the evidence points to Crabtree as the killer.

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