Murder at Random Claire McNab Paperback

Undercover agent Denise Cleever faces a daunting assignment: to infiltrate a shadowy terrorist group that pays amateur contract killers a considerable bounty for every successful random murder. It's mandatory that each death be brutally violent and attract maximum publicity. National exposure gets a substantial bonus; making the international media network doubles the original fee. Deeply undercover, with no back-up if things go wrong, Denise realizes the fate of thousands is in her hands.