The untold true story of German U-boats in World War II operating alongside the Japanese to wreak havoc in the Pacific Theater.

Very little has been written about the U-boat war in the Indian Ocean, where almost forty German submarines were assigned to operate from the Malaysian port of Georgetown alongside troops of the occupying Imperial Japanese forces. From that base, they sailed across the vast Indian Ocean and into the Pacific.

Success in this theatre of war could have shifted the North African conflict in favor of Rommel. The joint operations with the Japanese allowed the Germans to penetrate the Pacific Ocean for the first time, attacking shipping off the Australian coast and hunting off New Zealand. Plans were even made to attack US supply lines.

The story of this "unknown facet of the naval war is brought to light through the words of the sailors who crewed the submarines, existing records, and sharp analysis of the war these men fought" (Warfare History Network).