Henry's grandmother used to talk about sprites. She saw flower dragons hiding in broken flowerpots and hoarded invisible creatures in antique boxes. Nana spent more time with sprites than people. In this magical, Ghibliesque fairy tale, Henry embarks on a quest to find Nana's spirit, following a strange boy in a cape and star pyjamas up into a world of floating gardens where magic is fading, but ghosts can still be found.