With two members of The University panel dead, focus turns to the one remaining member, Police attention turns to Professor Peter Cherry.
Once again, I find myself laying yet more praise, I thought this was an excellent conclusion of yet another great story, another superb performance from Kevin McNally.
They could have gone a bit further with Jack's storyline, but what was done, was done very well.
The BBC is facing heavy criticism right now, and some of it is well due, it does have a very distinct view of things, but you have to credit this episode for not sticking to the narrative, it dares to offer several different view points.
Back to the good old days, lots of organs and body parts, it really did feel like a step back in time.
It's like a total reaction and reversal to the abysmal previous series. They've made a clear decision to revert to giving fans want they want.
Excellent, again!
9/10.