Logan believes that the killer has to be someone close to Alex Maclennan and enlists Alice Maclennan’s help in setting up a trap to lure the killer. She asks Alice to phone both Ross and Johnstone to say
that a neighbour, Mr Fraser, saw somebody enter
the Maclennans’ house through the bathroom window, and is going to give the police a description. Meanwhile, the police lie in wait at Fraser’s house, with Sergeant Grant pretending to be Mr Fraser. Late that night, a figure dressed in black enters and puts
a knife to Grant’s throat. The police burst in and the mystery man is overpowered – it is Ross. The final details of the case are tidied up. Alice Maclennan admits that she and Ross had been lovers, but she had finished the affair, and she and Alex had been trying to patch up their marriage. The story ends with Logan arranging to meet her journalist friend Tam to give him a scoop story – the identity of Alex Maclennan’s murderer.