They don't have to wait long. The British government has covertly acquired a small island in the Baltic, off the north coast of Germany. The island is unremarkable save for one feature: a natural sea cave, unknown to the Germans, large enough to house several aircraft.Biggles' orders: wreak havoc on German forces for as long as possible without compromising the location of the secret base. It's a dangerous mission, for the might of the enemy military machine will be bent on finding them, led by Biggles' old nemesis, Erich von Stalhein.