In the novel Wolf by Wolf, by Ryan Graudin, Yael the main character is chosen as a young child to go through testing. They are testing a serum that makes you able to change your appearance. Yael was picked out of a crowed to be tested on. So far she has made it through all testing and she is now beginning to learn how to change her appearance. She changes her appearance to join a race called the Axis tour. The winner of the Axis tour gets to go to a ball with Hitler, it is there where Yael wants to kill Hitler. She has to win the race to get into the ball, she just started the race.