A consignment of industrial diamonds is hi-jacked after its arrival in England, and the Saint plunges into a case full of unexpected twists and turns.
Steed joins a secret society, Emma walks the plank.
Military Intelligence asks Peter to undertake a mission to rescue an intelligence operative. To free the man, Peter and a local resistance fighter must breach the high-security hospital and get the operative out.
Disguised as a monk, Robin visits Friar Tuck, a jovial, fat, holy man, and together they organize the escape of Mildred from the clutches of the Lord Germaine and the Sheriff. Though his church is in Nottingham, the friar becomes a close ally of the outlaw and begins to pay frequent visits to Sherwood.
