Today only on amazon.com for $4.99 (kinda high for a bargain, I know), usually $14.99
The Tangled Tree: A Radical New History of Life by David Quammen
https://www.amazon.com/gp/product/B075RX2QY4/
I read this last summer/fall and really enjoyed it. It lays out the changing understanding of the evolutionary "tree of life" from Darwin to present. (If you aren't going to read this book, you should at least read up on why bacteria evolve much faster than is explainable by their fast replication.)