In the book, there's this idea called the "Intervention Theory." It suggests that aliens might have had a big part in shaping life on Earth. The book doesn't just say this; but attempts to show proof.
A lot is mentioned about fossils, using them to question common scientific ideas about how humans and other life started. Even with all our modern science, some things we believe might be based more on guesses than solid facts.
If you like different and cool ideas about where the universe comes from, this book is like a big plate of brain food. I liked reading it, but sometimes felt that the book had its biases and ignore some strong opposing views or was a bit one-sided.
Without spoiling the surprises in the book, I'd recommend reading "Everything You Know is Still Wrong" if you're curious about its topics. Like any cool book like this, it's best to go in with an open mind but also think critically about what you're reading.