Preparing to retire early from an unfulfilling teaching job, Liam Pennywell struggles to recall missing memories of the night before he awoke in the hospital with a head injury, an effort that leads to unexpected discoveries.

When a body turns up in her driveway, former spy Maggie Bird, forced into retirement after a mission went tragically wrong, turns to her "Martini Club" of former spies to help her uncover the truth about who is trying to kill her, and why.