The Tyrannosaur Chronicles is a pretty entertaining survey of everything we currently know about tyrannosaurs — not just T. rex, but the related tyrannosaurs. That means it includes dinosaurs we don’t always think of as tyrannosaurs, but which are classified as types of tyrannosaur because of their close relationship to T. rex. The book is upfront about the fact that the information in it is going to be out of date before long — though not, I think, from the perspective of a layperson.
A lot of the info is stuff you may well already know, like the fact that T. rex was most likely feathered. But this book discusses it in detail, going into parts that were likely to be feathered, where the tyrannosaurs might have been scaled as traditionally depicted, etc. There are various different cases where there are theories about the tyrannosaurs that can’t be proven one way or another, and this book goes into them in detail. It discusses the evidence and findings, bringing them together into an entertaining and informative package of pure tyrannosaur-related awesomeness. It never got too dry or anything; I found all of it interesting and relevant.
Like all the best dinosaur books, it made me want to run out and become a palaeontologist, somehow. And it also made me crave overviews of other dinosaurs — can I have a book like this about the sauropods, now? Please?