Robert Horton, perhaps best remembered as Ward Bond's scout in the early years of the western TV series "Wagon Train," stars in this espionage drama about an ex-agent whose former boss won't let go. John Smith (Horton) is trying to make a living as a London private investigator and have a happy relationship with his girlfriend, a high fashion model (Jill St. John), who knows nothing about his previous employment. When Smith's ex-boss Max (Sebastian Cabot) has a sticky problem, he manipulates Smith into getting involved against his (Smith's) better judgment. Settle in to your chair and be prepared to pay close attention, because if you don't, you could be lost at any one of several plot twists, courtesy of novelist/scripter Jimmy Sangster. It is well worth the effort, though, especially if you like your spies more like George Smiley than James Bond.