Deep time is the time deep in the past. The Deep Time Diaries is about two kids named John and Neesha Olifee and their parents. The Olifees one day found a pair of asteroids, Beta and Alpha. When they went into one of them, Neesha found a "room". One day when she was exploring the room she found what she thought was a bug on the wall. When she looked closely, she found out that the bug was a robot. Then the robot did something weird. He went into a keyboard of some kind and formed itself into one of the keys. Then, Neesha called her family. All four of them tried to pull the bug out but they couldn't do it. Then the accident happened. The room was a space ship. The bug made the ship work, and it zoomed to a wormhole made out of two black wholes in the middle of the asteroids. That was the beginning of the Time Travel Tour.
They measure the times that they have been by jumps. Jump 1 is terators and tar pits. In this jump, they discover a mini buggie in the ship and go out exploring finding lots of species from the ice age. With each jump they go farther back in time and understand more about the ship and the bugs it contains. They go all the way to Jump 8 where they discover a mysterious truth which I will not tell you because you will be looking forward to discovering it at the end of the book, but I will tell you that there is a truth. This book also has a few things for "21st century explorers" to do, like places to visit where you can dig fossils, research projects, and other books to read.
If you like science, prehistoric creatures, getting scared out of your wits (just kidding!), and laughing, read this book.