"It can make you strong as you can be," Mr. B said, "and as smart as you can be." "It has magic powers, then?" Sebastian wondered. "You already have the power. The token can help you learn how to use it." For Lilly and Sebastian Kemp growing up in New York City, Central Park is their backyard, the Museum of Natural History is their biology classroom, and the Central Park Zoo is where they learn firsthand about animals-including Lilly's beloved snow leopard. Thirteen year old Lilly is smart, strong, and very logical. Below her cool exterior, she hides the devastation she felt when her father left the family for California. Her eleven year old brother Sebastian is a gifted math whiz who builds his own computers and plays high level chess. He amuses his mother and sister with humorous, fantastic stories. But he is short and gets along better with animals than with people and he wishes he didn't feel humiliated almost every day at school. On her winged roller blades, Lilly tows Sebastian on his scooter to and from school and to his chess lesson with the elderly Mr. B. He knows both kids are afraid to face their biggest challenges so he gives them an old subway token. If they believe, they can use it to find the courage and the inner magic to go on adventures that the rational Lilly thought could never happen.