Night at the Vulcan

“Gas!” Parry Percival said under his breath. Martyn, who thought the Doctor was doing well, glanced indignantly at Parry and was astonished to see that he looked frightened. “ ‘—therefore,’ ” the Doctor was saying arrogantly, “ ‘to beg will not become me—’ ” “Gas!” said an imperative voice off-stage and someone else ran noisily round the back of the set. And then Martyn smelled it. Gas…