Spending spring break in Peru with her grandmother isn't sixteen-year-old Jade's idea of fun. She'd much rather be with her friends at Lake of the Ozarks. Then she meets Felix, a museum director's son. Jade discovers only she and Felix can telepathically access messages left on engraved stones in the age of dinosaurs.
Following the ancient stones' guidance, they enter the Labyrinth of Time and--with a shapeshifting dog's help--seek a red crystal called the Firestone. But time is running out before the First Men return on the night of the second blue moon.
Can Jade restore the Firestone's powers before the First Men return to judge humanity?