May, 1941. At four in the morning, a rust-streaked tramp freighter streams up the Tagus River to dock at the port of Lisbon. She actually is the Santa Rosa; she flies the flag of neutral Spain and is in Lisbon to load cork oak, tinned sardines, and drums of cooking food oil bound for the Baltic slot of Malmo. Just she is not really the Santa Rosa, she is the Noordendam, a Dutch freighter that sails for the Intelligence Division from the British Royal Navy and she’ll insert detection equipment for a clandestine operation in the Swedish coast — a top secret objective, a dark voyage. Here is an epic story of battle and espionage, of spies and fugitives, of love in secret resort rooms, of courage when confronted with impossible odds.