But just as Audrey was turning the corner, she stumbled over something which was lying on the ground, and fell forward with her head against the flat tombstone. What could it be? There was no grave close to the wall, and she had felt quite safe in walking there. Audrey sat up and rubbed her head, and wondered more and more what had made her fall. It was very dark at this side of the church, for a thick yew tree overhung the flat tombstone, and Audrey could distinguish nothing whatever.