August 1915: Charles Gaylion's plane is set on fire despite him not having sighted the enemy. Triggers receives information about increased casualties among British pilots and he, Charles and Alan Farmer puzzle over the source of the danger. A new arrival, Lieutenant Conrad, makes few friends because of his superior attitude, but his superb eyesight becomes an advantage when he sees that what Charles and others have mistaken for a French Morane is in fact a German monoplane. Back in England, Lorna has volunteered to be a nurse and is looking after injured pilots; she begins to realise the dangers Alan faces. Triggers is frustrated that his superiors do not believe their planes are being outclassed by the Germans but his frustration turns to anger when a magazine sent to Alan by his mother provides the answer: the Germans have developed a machine gun that can fire through the propeller. With Farmer and Conrad as back-up, he lures the German monoplane into attacking him until it is driven off by Conrad with a hunting rifle, giving him the evidence he needs to alert the rest of the RFC. (thetvdb.com)