Russia, 1919: Lt. Commander Bob Cowan is serving with the Royal Navy in the Black Sea when he is briefed to locate and rescue two British girls, thought to be working as nurses with the White Army.  Their  parents are frantic with worry – the Bolsheviks’ treatment of young, attractive female prisoners is harsh.  But when the news of the Front’s collapse reaches the Navy, Cowan is already pushing on into the interior – and even if the recall signal reaches him it’s conceivable that he’ll ignore it.