Buddies Sim and Bob arrive at the house of their friend Dr. David Rankin one Sunday morning to go fishing, and find him in the cellar cementing over a newly laid floor. His wife Irene is not at home and Rankin tells them that she is staying with friends. However her infidelity is well-known around the village and Bob and Sim make the mistake of surmising that Bob has killed and buried his wife. They think he cannot hear their discussion as he is out of the room, but he can, with lethal results.