Record your own exciting adventures, awesome expeditions, and incredible discoveries in your very own Explorer Academy Field Journal! You've read along as Cruz Coronado and his friends travel the globe. Now let National Geographic Kids help YOU explore and chronicle your own adventures! Go on cool missions, jot down your thoughts and feelings and imagine what colour your emotoglasses would be, make lists and maps for your future world travels, and plot where you would hide your cipher pieces in your own mission-saving scavanger hunt! These and many more exciting prompts will help you discover your inner explorer and determine if you have what it takes to be a part of the Explorer Academy!

Game theory has brought me to this point and I must follow where it leads. Even though this is not a game.Jamie is a sixteen-year-old maths whiz. Summerlee, his older sister, is in the grip of a wild phase. Tensions at home run high.When Summerlee wins a 7.5-million-dollar lottery, she cuts all ties with her family. But money can cause trouble - big trouble. And when Jamie's younger sister Phoebe is kidnapped for a ransom, the family faces a crisis almost too painful to bear.Jamie thinks he can use game theory - the strategy of predicting an opponent's actions - to get Phoebe back. But can he outfox the kidnapper? Or is he putting his own and his sister's life at risk?A brilliant, page-turning YA novel from a superb storyteller.