This is a lengthy, meaty story with a lot of double plotting and intrigue just like the classic television spy shows it's meant to be emulating. Anya and Mark go to a Thal planet (didn't know those existed), and there's a lot of good, clever discussion of just how far the Thals' pacifism can be pushed. We know what will become of Mark Seven, but to hear him discussed as the 'anti-Dalek' adds another layer to the fight. It's not quite as well-paced as the first story and has a few too many shifts, but I'm enjoying it. The retro music helps!