after the motorcycle accident that had killed miranda , he had picked himself up off the pavement shaken but unhurt ( except for a small scratch across the back of his left hand , must n't forget that , purple hearts had been awarded for less ) and the truck driver had walked over to him , casting two shadows in the glow of the streetlight and the head lamps of the truck - he was a big , balding man with a pen in the breast pocket of his white shirt , and stamped in gold letters on the barrel of the pen he could read 'frank 's mobil sta ' and the rest was hidden by the pocket , but ben had guessed shrewdly that the final letters were 'tion ' , elementary , my dear watson , elementary .