Callan must stop an old friend, Clarke, from going back to Africa, where he was training mercenaries, else Hunter will have Clarke killed.

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.

After Hunter's death Meres and Calln must fetch the new Hunter from East Germany.

The French O.A.S. carry an internal war into England. Callan and Meres must sort out the mess.

Callan brings confusion into a Russian spy network.

An exchange of captured agents with the Soviets goes sour.

Callan is assigned to disrupt a romance between a government worker and a suspected spy. Reluctantly he delves into his bag of dirty tricks.

Callan looses his position as Hunter when he goes after the assassin who killed Cross.

Callan tries to quit the Section when a girl he is seeing takes a dislike to his job.

Richmond, a top enemy defector, reveals his true purpose.