Been wondering how Matt's love-life is getting on? Well, so far, pretty sweet. But Emma's about to get some insight into what her boyfriend does for a living: some days he has to break up fights, calm down volatile people and be faced with a gun pointed straight at his head. How's she going to deal with that?

This episode is the tale of some pretty tough men who did a very bad thing many years ago in a war zone. Now, with the men back in their safe, comfortable suburban lives, what they did is coming back to haunt them. Is it karma? Paranoia? Or does someone know what they did? And does that someone want revenge?

Watch for: Big guns. And one very adorable TV baby.