Halfhyde and the Guns of Arrest (The Halfhyde Adventures, No. 3)

Royal Navy Lieutenant St Vincent Halfhyde is once again despatched 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.