Children from a school on the Isle of Mull, a pony club in Berkshire and a debating club in Bradford explore what it means to grow up. 9-year-old Sophie dreams of riding at the Olympics, but is struggling to get back in the saddle after breaking her leg in a bad fall, Arwen looks beyond the isolation of Mull for her future, whilst Daniel is desperate to become a renowned scientist but has a back up plan of a magician.