Detective Murdoch investigates the murder of Julia Ogden's husband, Dr. Darcy Garland who is found on his living room floor with a bullet through the head. No murder weapon can be found and there is no sign of forced entry. His housekeeper, a somewhat hostile Mrs. Weller, confirms that Garland kept a gun in the house. She also says she had been given the day off by Julia who, according to the neighbor Mrs. Smythe, arrived a short while later. Chief Constable Giles removes Murdoch from the case given his relationship with Julia and takes charge of it himself. As the evidence mounts, Julia is arrested and goes on trial. Murdoch is convinced she is being framed.