They must have gone into the control cabin almost on the heels of the unseen—if the unseen had heels, which there was good reason to doubt—for Bat crouched just within the doorway and refused to move on. Steena looked down the length of the instrument panels and officers’ station-seats to where Cliff Moran worked. On the heavy carpet her boots made no sound and he did not glance up but sat humming through set teeth as he tested the tardy and reluctant responses to buttons which had not been pushed in years.