Published in Diana, #187 09/17/1966 to possibly #195 11/12/1966.
Miss Z sends Gale Price and Nicola Main to an "adventure school in the mountains", apparently in the northeast part of Wales where "a reign of terror has hit" which threatens to close it down. "Find out what it's all about," she directs. At work are some very dangerous operatives from O.C.T.O.P.U.S.