Marty doesn't have much. Unlike his mum, who has billions of things: newspapers, holey shoes, rusty lawnmowers, broken picture frames - she keeps EVERYTHING! It's hard to leave the house. Marty does his best to look after her and wonders if anything will ever change. But on Marty's birthday, Grandad, with a glint in his eye, gifts Marty a very special seed. Grandad hasn't been this excited since he invented the bum scratcher 2000 or thought he'd brewed wonder fuel from rhubarb leaves! The seed grows bigger and bigger, and launches Grandad, Marty and his best friend Gracie on an impossible, wondrous plan fuelled by love, hopes and dreams.