NEW YORK TIMES BESTSELLER • Blast off into a sci-fi adventure in this electrifying debut novel starring Aku—the groundbreaking 3D character who graced the cover of TIME Magazine.

'The plot is compelling and fast paced, with nonstop adventure....An entertaining sci-fi romp with grounded, real-world tween struggles.'—School Library Journal

Aku has always dreamed of becoming an astronaut. It’s easier to picture life among the stars than deal with the bully at school—or the pain of his grandfather’s mysterious disappearance. But when a strange space helmet shows up in his basement, Aku is pulled into something far bigger than he ever imagined.

The space helmet doesn’t just look cool—it teleports him to Ibra, a distant planet under siege. There, precious Lunaberries are being stolen by a ruthless space militia, and Aku’s grandfather may be the key to stopping them. With the help of his best friends and a few unlikely allies, Aku must dream bigger than ever before, find the courage to lead, and discover that bravery isn’t about having no fear—it’s about rising above it.