CI5 - Criminal Intelligence Five - is the most secret security force in the world. Even most governments are unaware of its existence. Those in the know refer to them only as The Professionals.

If you didn't see it on the news this morning the chances are that CI5 took care of it last night.

Born in Ireland and trained by the CIA, Malone was one of the West's most successful operatives behind the Iron Curtain in the Cold War.
Tough on his CI5 agents, and the scourge of politicians, Malone lives on a knife edge; if CI5 is to survive it must get results - even if it means breaking all the rules.

Born in New York, Agent Backus is 26. A computer science graduate, she worked briefly for IBM but was soon offered an encrption assignment by the CIA.
Quick witted and with enough style to be supermodel, Tina backus quickly gained a reputation as one of the most effective agents in the CIA. Even the resourceful Malone had to pull powerful strings to get her transferred to The Professionals.

Chicago born Keel is 30 years old, a graduate of Annapolis and an ex-Navy Seal. His secret assignments for the Navy brought him a clutch of citations and medals.
Despite his charming smile and laid back manner, he is like a coiled spring inside - an explosion waiting to happen.

Agent Curtis was born in London on the wrong side of the tracks. His determination to succeed won him an honours degree in languages. Head-hunted by the British Secret Service, he became an undercover man in some of the most dangerous parts of the world. Gritty and down to earth, Curtis is one of the most popular agents in CI5, but he has a streak of ruthlessness that worries even Harry Malone.