T. Rex and the Crater of Doom by Walter Alvarez lays out the current thinking on what killed the
dinosaurs. Alvarez provides a detailed
history of the thinking on this question over time & how new evidence lead
to a change in the answer. The book is
highly readable and very interesting.
The author explains the science in a cogent way that is understandable
even by those who don’t have a background in any of the myriad of areas
covered.