Royal Navy Lieutenant St. Vincent Halfhyde is once again dispatched to Africa. This time, his mission is to help capture a British traitor who carries secret blueprints of British warships. Assisted by a Scotland Yard detective and a handful of sailors, Halfhyde must outwit the clever Germans, who are determined to take the traitor and his secrets back to the Fatherland.

Philip McCutchan served on various British war ships during WWII. Afterwards, he concentrated on writing, publishing more than 80 books, including the fifteen-book Halfhyde series.