JSA Liberty Files - The Whistling Skull (2013)

In 1940s Europe, the Nazi war machine is on the move...but crimes are still committed in even the smallest hamlets. One heroic duo must solve the most bizarre mystery of all, but when dealing with Der Karneval, the current Whistling Skull and his partner Knuckles must learn to rely on the memories of the Whistling Skulls that came before and uncover a mystery all in the midst of the greatest war in world history!