Holland, 1944: having worked as an undercover agent for the last year, Nancy Callaghan is given her toughest case yet. When a key resistance member is captured by the Nazis, Nancy is asked to roleplay a rich Nazi woman to win over Detlef Keller, a notorious member of the SS, in order to gain crucial information. Back in England, Tom hears the devastating news that Holland is once again occupied by the Nazis, completely cut off from the rest of Europe, and from Nancy. He and Nancy had worked together at Baker Street, and had quickly fallen in love. Desperate to rescue her, he and her brother Neil come up with a plan to bring her home, called Operation Orange. But as Nancy infiltrates the Dutch SS, she catches the eye of an even more senior member of the Nazi Party. Has Nancy finally found herself in at the deep end, and will Tom manage to reach her in time, before she gets caught?
