Weeping Angles are very visual monsters so I feel that doing a good audio with them is challenging. However, I think this one succeeds. That's because the Angels aren't really the driving force behind the plot: there is a larger mystery, related to the Angels, that is really what creates and maintains the tension. This mystery is engaging and clever. Subtle hints are dropped throughout that makes the final twist and resolution feel relatively natural. The writing itself is engaging and the characters are strong: the Doctor feels like the Doctor and the original characters feel fleshed out and well-rounded.