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Cathy is informed that she is of royal blood -- and in fact is next in line for the British throne. Unfortunately, her only chance of assuming her proper place in life is if an impending military coup is successful. It is up to Steed to prevent that coup. . .but can he rely upon Cathy's cooperation this time out? Written by Eric Paice, "Esprit de Corps" was initially telecast in England on March 14, 1964; American viewers didn't get to see this episode until it was cablecast on April 5, 1991.