Mystery! Episodes on PBS

“The Inspector Lynley Mysteries: One Guilty Deed” finds the reinstated Lynley joining Havers and DC Nkata as they close in on an organized-crime boss (Tom Georgeson) when their informant (David Hepple) is found murdered on the south coast. Although the slaying appears to be a contract killing, Havers has her doubts when she learns of a 20-year-old unsolved murder that occurred in the area. Carly Baker: Esther Hall.