A spooky old house, a historical mystery, an underground mine, and a rising tide--the stage is set for an exciting adventure in the tradition of Enid Blyton and Arthur Ransome "Come round here " called David. "We've found something." "I'm showing them." Andrea pushed him aside. "It's my cave " She lowered herself into the hole. Her head disappeared, and a moment later they heard her voice, faint and slightly hollow...