Arthur Askey plays a young, absent-minded meteorologist (Arthur Pilbeam). He gets himself assigned to a remote Scottish lighthouse to avoid women, after he is jilted by his fiancée. He will be the only occupant of the island.
Then the island stats to fill up with stowaways and the survivors of a sinking boat. Things are crowded until the people start to disappear, one-by-one. Pilbeam has stumbled across a group of Nazi spies.