He pulled it open. a crack revealing the moonlit courtyard, and took a long, careful survey. ... That grim sentry over yonder by the gate must be noiselesst and effectually overpowered, and that at once. ... It struck the astonished guard on the forehead with a sharp click that echoed a#39;across the courtyard. and without a sound he ... \Vith a low exclamation of triumph Canaris pulled from the Nubiana#39;s waist a narrow belt on which hung a ponderous iron key. ... We are safe for the present.