S4, E8: With Michael clinging to life, Tactical Response endeavour to nail the people they hold responsible for his shooting. The Rainey family is square in their sights, until an unexpected discovery shifts their focus to Cleo – Stella’s girlfriend. At the hospital, events spiral out of control when Col Rainey is shot dead by a Russian criminal. In his escape, he abandons a sickly accomplice, who is suffering radiation poisoning, leaving the team to wonder what the hell the Raineys are messing with that involves Russians and radiation…