As American involvement in WW II grew imminent, President Roosevelt authorized the establishment of the Office of Strategic Services (OSS), the predecessor of both the CIA and military Special Operations Forces. Using military cover OSS began building a clandestine capability to combat the Axis powers, in which saboteurs, guerillas, commandos, spies and counterintelligence agents worked behind enemy lines.

Captain James Cantrell, a former Chicago homicide detective, is the leader of a secret intelligence team for OSS. He is charged with protecting Operation Overlord, the top-secret Allied plans for invading France, and with ferreting out Nazi spies who are desperately attempting to uncover these secrets. With time running out before D-Day, Cantrell must stop a cunning--and seductive--female Gestapo agent operating in London from delivering stolen Overlord information in time for Hitler to reinforce defenses at Normandy. The chase leads him through bomb ravaged London streets and across the English Channel only hours behind his prey. Parachuting into France behind enemy lines only days before the scheduled D-Day landings, his orders are to assassinate her before she reports to her contact on the French mainland. The fate of WW II hangs in the balance.