Dark Summer

When Eddie discovers a secret passage in Wookey Hole caves, he just has to find out where it goes. But his amazement quickly turns to horror when he gets lost in the dark. He's underground, on his own, and nobody knows where he is . . . Until a hand reaches out of the blackness. A strange, pale girl helps Eddie get back to the surface, but she can't seem to leave the caves herself. Who is she...