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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.

Colonel Sangster and his gang are smuggling art treasures and industrial secrets out of the country and selling them on to foreign powers. Tibbs, Sangster's pilot, uses a complicated method of getting the crates with the illegal cargo past customs by taking them out of the country having misdeclared them on paper-work and, having been recalled to rectify the mistake, substituting an innocent cargo which is passed by Customs. Doyle goes undercover to infiltrate the gang.