This third installment in the popular action-packed Crime Travelers Spy School series from Amazon's best-selling and award-winning author Paul Aertker is a mind-opening adventure for elementary and middle-grade fans of Gordon Korman, James Patterson, and Stuart Gibbs.

Funny. Smart. Action. Priceless continues the international invasion of The Crime Travelers Spy School Adventure Series.

Lucas Benes faces his greatest challenge yet when he finds a secret message from his mother hidden inside a sunken cargo container. In a near-death scuba diving experience, Lucas and the new resistance kids learn that Good Company CEO Siba Günerro - along with her newest and most beautiful Curukians is planning a massive art heist. Lucas and friends scour the Spanish countryside looking for clues. But to unravel the mysteries of both the robbery and the cryptic message, Lucas must first discover the only thing that is worth more than priceless.

"If it's opposite day, it could already be opposite of opposite, which would be confusing." If you find this line puzzling, then you might understand why the kids of the new resistance are able to rattle the Good Company yet again in Priceless.

This funny, smart, and exciting middle-grade series with short chapters is perfect for elementary school and middle school book lists. The series is designed for kids ages nine to 12, for boys and for girls - a book series for all kids, the world over.