George Furnace, flight instructor at Baston Aero Club, dies instantly when his plane crashes into the English countryside. People who knew him are baffled - Furnace was a first-rate pilot, and the plane was in perfect condition - and the inquest records a verdict of death by misadventure. An Australian visitor to the aero club, Edwin Marriott, Bishop of Cootamundra, suspects that the true story is more complicated. Could this be a dramatic suicide - or even murder? Together with Inspector Bray of Scotland Yard, the intrepid bishop must uncover a cunning criminal scheme.