noon
A week passed . Then another went by . But excepting for one or two snatches of talk , seemingly innocent , the watchers at the wireless caught nothing . Then , as Roy was listening in one noon while his comrades were down-stairs at luncheon , there was a sudden buzzing in his ear . Rapidly he shifted coil and condenser until the vibrations came sharp and clear . A call was sounding . 2XB was calling 5ZM .