midnight
Rolf thought he knew that voice ; yes , he was almost sure it was the voice of Francios la Colle . This was important but far from conclusive . It was now eleven . He was due at the canoe by midnight . He made for the place as fast as he could go , which , on such a night , was slow , but guided by occasional glimpses of the stars he reached the lake , and pausing a furlong from the landing , he gave the rolling , quivering loon call : Ho-o-o-o-ooo-o Ho-o-o-o-ooo-o . Hooo-ooo . After ten seconds the answer came : Ho-o-o-o-o-o-o-o Hoo-ooo .