EW has learned exclusively that Rick Riordan — whose mega-selling Percy Jackson books have long been the rage in the 8-to-12 set — will be embarking on a new fantasy series. The Kane Chronicles, Book One: The Red Pyramid goes on sale May 4, 2010. “As a teacher, I’ve had so much fun watching Percy Jackson ignite kids’ interest in Greek mythology, but in my classroom, one subject was even more popular,” Riordan tells EW. “Now I’m excited that The Kane Chronicles can introduce young readers to one of my all-time favorite topics — the amazing world of ancient Egypt.”

Here’s a first peek at the book’s as-yet-unfinished jacket.