This one is the only one of the trilogy I can say is actually excellent. Maybe I was over hyped but I didn't really like Omega and I thought Davros was really good but lacked something.

In this case both the main plot and the character flashback are intertwined so it is a far more cohesive story. The slow build up and tension is perfect, the setting is eerie and each revelation is wonderfully realised.

The resolution is left open ended, which I normally like, but in this case I would have preferred if they went all in and gave us the Master's choice (I mean they already have contradicted a lot of the character's canon so who cares)

So yeah, the dialogue is excellent, the concept of Death intriguing and McCoy is in top form.