I really like this book. When I read I couldn't wait to see what happened next. I am now excited to read more books from the author Stuart Gibbs.

This was the first book I read by Stuart Gibbs. Afterword I went to the library and checked out the second and more Stuart Gibbs books.

I think that it s a good book because it keeps you on edge all the time. And I also like the author stuart gibbs.

Great book. Good if you like adventure and/or spy stories

Before i read this book i didn't know anything about Albert Einstein besides that he was a MAD scientist.So if YOU[yes you ,whoever you are] want to get DRAGGED into this mess and want to learn more about Albert Einstein. Then i suggest you go and FIND Einstein's LAST EQUATION [This book; CHARLIE AND THE LAST EQUATION]🏃🏼‍♀️💼OH and HAPPY NEW YEAR🎆🎉🎊