I just finished Steve Brusatte's 'The Rise and Fall of the Dinosaurs' yesterday and found it to be very engaging. As well as detailing it's namesake, it also introduces many of the tools and methodologies that are used by paleontologists to come to the conclusions about dinosaurs that are in the book.

It also has a great "Notes on sources" chapter at the end of the book that breaks down the authour's sources for each chapter in the book.