Convergence by Stan Lee, Stuart Moore and Andie Tong (Lexile: 600; Interest Level: Grades 4-9) is first book of the Zodiac Legacy Series. Stan Lee, for those who don't know, is the father of Marvel Comics.
Steven is visiting Hong Kong with his class. While on a museum tour, he hears a strange scream and sneaks off to investigate. What he finds is a secret stairway leading to an ancient chamber full of strange, glowing pools and something he will find out later are called ley lines. Steven witnesses a man on a hovercraft going from pool to pool seeming to gather energy of some kind. And, he sees their odd museum guide sneaking around the edge of the room. Little did he know that he was about to get sucked into the world of super powers, with both heroes and villains--and he would have to choose which side he was on!
A power source tied into the Chinese Zodiac is unleashed and seeks hosts throughout the world who must choose to use their new power for good or evil (although it is sometimes hard to tell which side is which), but above all, they must first learn to control it so that it does not control them. Fans of the great Superheroes, and we almost all have a favorite) will be sucked into this book, which is a fast read, despite the length. (512 p.)
One of the reasons I became an elementary school librarian is so I can read children's books.