midnight
Wake up ! '' Peggy shook the shoulder of her brother , who had dozed off in a rough chair formed out of an old flour barrel . She glanced at her watch . It was almost midnight , and half an hour since the steady footfall of the sentry , who was keeping desultory watch on the captives , had passed the hut . Roy was wide awake in an instant . He sat up staring wildly about , and then , casting sleep from him , he listened intently . Tap !