Survivor's Leave — Robert Sutherland

Young Adult Fiction. This young adult novel features two Canadian sailors whose ship is torpedoed at sea during WWII and whose shore leave takes them to a run-down manor house in Cornwall. Their stay turns out to be more exciting than the boys could have imagined, as they soon discover that sinister forces have an interest in what lies hidden below the house: the Nazis have hatched an unprecedented scheme involving biological warfare, and it seems the caves are the perfect place from which to set the destruction in motion.