It was April 1943, and World War II raged throughout Europe when four English teenagers were hunting for birds' nests in a private estate near Birmingham named Hagley Wood.
Bob Farmer climbed up an old Wych-elm tree, looked down the stunted top and made a gruesome discovery inside the hollowed out bole that has mystified police ever since. It was not a bird that stared back at him, but a human skull.
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