Book 4 of the American Spy Sisters - Inspired by the brave U.S. women secret agents working for Britain's intelligence agencies during WW II. Lacy Farrington Forbes never wanted the life of a debutante. But after a family tragedy pulls her back to America from a post-deb whirl in London on the brink of WWII, she trades ballrooms for battlefields-volunteering with the Red Cross to raise funds for a field hospital near the Russian-Finnish front. Dr. Charles Pembroke III is a young Boston-based doctor who defies familial pressure by earning a degree in structural design at night and then impulsively joins Dr. Noah Fischer's Finland Field Hospital project as a favor to his Harvard classmate. In spite of his best intentions, "Pem" is instantly attracted to Lacy who financed the endeavor and is serving as its 'Girl Friday.' After surviving a close encounter with Nazi troops and a harrowing journey back to the safety of England, Lacy finds herself falling for the married doctor by the time they land at the RAF airbase in Sussex. Torn in different directions by the disruption of war, Pem is ordered by British and American military authorities to design hospital trains carrying shattered Allied survivors from Europe's bloodiest battlefields. Meanwhile, Lacy is recruited by MI5 as an in-country, German-speaking secret agent tasked with preventing Hitler's infiltrating spies and Irish revolutionaries from blowing up the United Kingdom's vulnerable infrastructure. Dodging bombs, booby traps, and military regulations amidst the Blitz destroying England from the air, this unlikely "Deb at War" is forced to reconcile a tangled web of duty, honor, loss and enduring love while the fate of nations hangs in the balance.