When an innocent family is terrorised and their father murdered in cold blood, everyone knows that ruthless criminal Nick Mason is behind it. However, when Mason walks free from his trial, Helen calls on Jack Quinn and his team for help.

A young girl is murdered in what is apparently an open-and-shut case, but Helen is convinced that all is not as it seems and calls on the help of Jack and his team to prove that an innocent man has been set up by a disgruntled former policeman.

Jack and the gang become embroiled in the intricate world of foreign affairs when a wealthy businessman seeks diplomatic immunity in the Colombian Embassy in London.

Jack and the gang resort to desperate measures in an attempt to catch their slipperiest suspects to-date, a seemingly ordinary middle-class couple who have embezzled millions of pounds from charity.

When an innocent man is killed in cold blood and the murderer released by MI5 in the interests of national security, it becomes the team's mission to ensure that the killer doesn't walk free.

In their most dangerous task t- date, Jack and the team find themselves in a race against time to prevent a deadly new drug targeted at teenagers from flooding the country. The man behind the supply is one of Britain's most dangerous criminals.