The storm had broken. Peal after peal of thunder rent the air, echoing in the cavern till Peggy and Bobby clung to one another in terror, while the rain came down in a perfect deluge, with such tropical fury that it seemed as if the very sky were descending. Crouched down on the floor by the entrance, the children waited for the storm to pass by, wondering at the vivid pink flashes and the size of the hailstones which beat in through the hazel-bushes. A little runnel of water, flowing uncomfortably near, brought Peggy to her feet with a sudden cry.