Marion Lessing

Ignoring an ancient prophecy, evil brother Gregor seeks to maintain his feudal power on his his Tyrolean estate by murdering and impersonating his benevolent younger twin.

At the end of WWI the US Navy camouflages a battleship as a harmless schooner and sails for the Canary Islands to confront a notoriously effective German U-boat. No one sees the US submarine secretly escorting the schooner.