Piekalkiewicz traveled thousands of miles to interview survivors from both sides of these 27 underground missions of the second World War.

Montmartre, Grid H 18 -- Why Hitler did not come to London -- SOE : London trains saboteurs -- Alexandria : two men against a battleship -- Raid on a radar station -- HMS Campbeltown's last voyage -- Prague, 27 May 1942 -- Agent 54 -- Operation Frankton -- Codeword 'Red Chapel' -- Major Martin goes to war -- Postponed three times : the greatest tank battle of all -- Apres̤̀ nous le déluge -- Russia's forest Army -- Target Norsk Hydro -- Abor comfortably housed -- The pursuit of the Tirpitz -- Liberator AI 523 has crashed -- The citizens of Calvados -- A kidnapping operation on Crete -- Operation fortitude -- Tracking down the flying bomb -- A rocket vanishes -- The Warsaw rising -- The Weather Front -- Operation Griffin -- Dr. Joseph Goebbels builds a fortress.