Grace and Ethan are back! And this time they are heading to New York! The stage is set. The World Young Inventor's Competition is on and Jet-bike is in with a chance. But before Grace and Ethan can become the next superstars, a horrible kidnapping takes place that involvess everyone in ways they never imagined. Take a ride through an action- packed adventure as they attempt to unravel the clues, solve the crime and win the competition. Will Jet-bike be the best invention yet? Jet-bike is the thrilling final chapter to the Jet-ball and Jet-board.