Tempted by the idea of duck shooting, Carruthers is lured by his friend Davies into a yachting expedition in the Baltic, only to discover that the itinerary involves more than killing fowl. Soon they're on a wild journey of intrigue, meeting danger at every turn, and ultimately unraveling Germany's ...

Tempted by the idea of duck shooting, Carruthers is lured by his friend Davies into a yachting expedition in the Baltic, only to discover that the itinerary involves more than killing fowl. Soon they're on a wild journey of intrigue, meeting danger at every turn, and ultimately unraveling Germany's secret plans to invade England.