Humans are really mixed up.
The book is focussed on what DNA call tell us about human origins. Reich makes an impassioned plea to let the facts speak for themselves. In other words, we should not let what we wish to believe hijack the search for truth. As a leader in the area, he delves deeply into what we can tell from DNA extracted from human remains around the world. The result is intriguing. At the current rate of new discoveries of human remains, however, the story will have a few more twists to go.
Link to book: https://www.waterstones.com/book/who-we-are-and-how-we-got-here/david-reich/9780198821267
You might also like to browse other evolution posts: https://www.thesentientrobot.com/category/evolution/