This series brings the mythological appeal of the popular Percy Jackson & the Olympians to younger readers. Written by the author of The Secrets of Droon, which has sold millions of copies and won countless devoted fans, this funny, high-energy adventure is sure to keep boys and girls turning the pages. An action-packed, mythological chapter book series from Tony Abbott! There's something lurking under Owen's school. . . . Owen Brown is just an ordinary fourth-grader at an ordinary school. Or so he thinks. Then his best friend, Dana, disappears right through the floor of their school — and Owen's normal life is turned upside down! Determined to find Dana, Owen and his friends Jon and Sydney set out on a mysterious, mythological rescue mission. But the three friends are about to discover that Dana's disappearance is part of a much larger riddle...and they're right at the center of it!