\'Yes，thecleverdevil!\'exclaimedHavill，unabletodepreciatelonger。
\'How?\'
\'Theriddlethathasworriedmethreeweekshehassolvedinawaywhichissimplicityitself。Hehasgotit，andIamundone!\'
\'Nonsense，don\'tgiveway。Let\'smakeatracing。\'
\'Theground-planwillbesufficient，\'saidHavill，hiscouragereviving。\'Theideaissosimple，thatifonceseenitisnoteasilyforgotten。\'