The hunt for a murdered courier's despatch leads Steed and Emma to a deadly car race with a "shocking" surprise at the finish line. It takes The Avengers to flag down the murderers and apply the brakes to their plans.
Agent Danvers dies in Steed's flat before he can give the exact location of a valuable dispatch that he has hidden. The flat is bugged and the avengers are pursued by a number of people taking part in a treasure hunt car rally organized by car-mad George Benstead to find the missing dispatch - the end result being truly shocking in the literal sense.—don @ minifie-1