England is torn in civil strife as the Royalists battle the Parliamentary Party for control. This conflict distracts people from rational thought and allows unscrupulous men to gain local power by exploiting village superstitions. One of these men is Matthew Hopkins, who tours the land offering his services as a persecutor of witches. Aided by his sadistic accomplice John Stearne, he travels from city to city and wrenches confessions from "witches" in order to line his pockets and gain sexual favors. When Hopkins persecutes a priest, he incurs the wrath of Richard Marshall, who is engaged to the priest's niece. Risking treason by leaving his military duties, Marshall relentlessly pursues the evil Hopkins and his minion Stearne.

During WW2 a British aircraft is shot down and crashes in Nazi held territory. The Germans capture the only survivor, an American General, and take him to the nearest SS headquarters. Unknown to the Germans the General has full knowledge of the D-Day operation. The British decide that the General must not be allowed to divulge any details of the Normandy landing at all cost and order Major John Smith to lead a crack commando team to rescue him. Amongst the team is an American Ranger, Lieutenant Schaffer, who is puzzled by his inclusion in an all British operation. When one of the team dies after the parachute drop, Schaffer suspects that Smith's mission has a much more secret objective.