about midnight
Hippy then assumed the duty of guarding the party , but not a sign of life did he discover , nor was there a disturbing sound to be heard . Supper was eaten in camp before dark and the cook fire then extinguished . Grace was troubled about Tom , and , as the hours wore on , the thought that perhaps he might have come to some harm , grew upon her . She got up about midnight , and , leaving her tent , sat down on a rock , chin in hands , more nervous than she remembered ever to have been before . Hurried footsteps aroused her to instant alertness . `` Is that you , Hippy ? '' called a low-pitched voice off to the right of her .