Killer Elite. Michael Smith/ Cassell, £8.99

THIS is a history of a top-secret US Army special operations unit and their deadly missions.

'The Activity' as it was known to insiders was abandoned – and then secretly resurrected – gaining almost mythical status as it undertook operations undercover in Beirut in the 1980s, captured Saddam Hussein, assassinated key members of al-Qa'eda, attempted to wipe out the drug barons of South America and, ultimately, hunted down and killed Sam bin Laden.

The author has spoken to many former members of the 'team' and gained special insight into the inner workings of each thrilling mission.