The inside job / Felix Riley.

Secret Service Agent Mike Byrne is too late...Too late to save the one man who knew the truth - the star witness who was about to blow the whistle on the biggest banking scandal in history. Too late to stop an innocent man from dying, and so plunging the world of high finance into a death spiral of violence and murder. Because payback for bankers who gambled with other people's money is being handed out in bullets and bombs. And now the only person who can keep the bankers alive is Agent Byrne, who finds himself having to protect the very people he swore to take down. Before long Byrne is locked into a deadly fight with an unseen enemy - an enemy that will stop at nothing to get what they want.