Dark Voyage by Furst Alan

Set against the backdrop of World War II, this gripping espionage thriller follows the perilous journey of a Dutch freighter, the Noordendam, as it navigates the treacherous waters of the Mediterranean. Under the guise of neutrality, the ship's crew, led by the enigmatic Captain DeHaan, undertakes clandestine missions for the Allies, transporting vital cargo and intelligence. As they sail through a sea fraught with danger, from enemy submarines to air raids, the crew must rely on their wits and courage to survive, all while grappling with the moral complexities of war and the ever-present threat of betrayal.