back to the book

After class John went back to the library and sneaked into the basement. He found the book that had the magic word in it and opened it. There were only a few pages still legible after years of water damage, mildew, moths, and rot.

One page had the word "supmet" : the power to freeze time.

Another had the word "latsyrc" : the power to remain unseen.

The last legible page had "lepmi" : to move with the mind

Which does he try first?