Book Mind Reading Trick

This is very simple yet, easy trick to do!
All you have to do was grab a book, it could be any story books/ novels.(here, I state the book as Book A) Then, you flip through Book A and simply asked your friend about how good the book is. In the same time, simply choose a page in the book, for example: page 56. Look at the first letter in page 56, then memorize the letter you saw.
After that, give Book A to your friend. Tell he/she to hold it for a second. You want to perform a trick. Take another book,(I state it as Book B) and flip through the book, flip to page 56 and tell your friend to do as same as you. Then, tell your friend to memorize the 1st letter in page 56 (in Book A). Now, you act like you want read your friend's mind. Make it looks hard. Then, you suddenly speak loud the letter you memorize. Your friend might be stunned by this point!
TIPS: When flipping through Book A, don't pause too long if you found your selected page! Next, practice more and more ! This trick must be done in perfect relaxation between the magician& the spectator.