Beyond Selidor

Interesting. My feeling is that it won't be anyone in AC-12 but who knows with this show? I haven't seen many people suspect Kate, mostly theories that she's going to die. My theory is that the forth man is either Osborne (I think he's the chief constable?) because it would tie things back to series 1 nicely or that James Nesbitt's character isn't actually dead and it's going to be him.