The Section's new Hunter has Callan pulled from the field.

Callan must prove that a young biochemist is not giving information to the East.

Callan apparently turns renegade. A ruse to trap the head of a ‘pipeline' for smuggling foreign agents and defectors out of the country.

Callan must use the wife of a rocket scientist as bait to lure the same scientist to Britain.

A freelance German mercenary organisation who specialise in eliminating foreign security sections have their sights set on the Section.