SOF intelligence operator Sue O’Connell, callsign MIKE4, returns to hunt down a terrorist network determined to acquire nuclear material for a dirty bomb. As part of that effort, Sue must rescue a kidnapped colleague someplace on the Syrian-Iraq border. Meanwhile, both her mother and her brother continue to face the threat of the vendetta with a Russian mafia family. As the story develops, Sue finds out that in the espionage trade, it can be very hard to distinguish between friend and foe.