Seeing pictures of the second and fourth Doctors on the cover of "Heart of Tardis" I was thinking wow another cross-over story... but I was so wrong. The book itself doesn't help by having incredibly small printing which makes it extremely difficult to read and after a few pages I thought is this really a Dr Who story?, who are these other people and how are they involved? what is this story about? I tried to read on a few pages and hoped the story would make more sense, but quickly got fed up and stopped reading it. There are lots of Dr Who books out there and this is the worst I've ever read.