CI5 must track down a chemical warfare expert who hopes to force the government to halt research into biological weapons and destroy existing stocks; if his demand is not met, he will contaminate London’s water supply with a lethal hallucinogen.

An attractive young woman steps into the path of a car driven by Sir Charles Milvain, a man widely tipped to become Prime Minister. It is an encounter engineered by a KGB agent seeking to secure high-level information by blackmailing Milvain over his imminent indiscretions…

Charley Turkel wants to get his brother Henry out of prison, and intends to do it by holding the Home Secretary hostage until his demand for Henry’s release is met. Cowley devises an unorthodox ploy to thwart the Turkels’ plan.

A Greek hitman smuggles into Britain a sniper rifle with a range of two miles. After he kills a police officer who stops him for speeding, a hidden compartment in an abandoned stolen car alerts CI5 to a high-profile assassination plot.

A US senator is shot dead in front of several motorists. To draw out his killers, Cowley submits a newspaper story claiming they were recognised. But the paper also prints the names of the witnesses, putting them in grave danger; fearless operative Tony joins Bodie and Doyle to try to reach them first.

A gang of mercenaries rob a bank, escape by plane, and parachute out: an operation designed to impress a gangland boss whom they then coerce into hiring them. The capture of their ruthless leader becomes a personal quest for ex-mercenary Bodie.