Twelve-year old Alice is growing up in a grey world of old bombsites, in post war London. It's a tough life made harder by her difficult step-dad. Alice's escape is her imagination, which always brightens her day. But when a new boy called Reggie starts school, her mind begins playing tricks on her. She seems oddly drawn to him and whenever they are together the world becomes a more exciting and colourful place. A place where imagination appears to become real: where a bubble-gum machine can suddenly explode into a thousand coloured balls, a handful of fireworks become the greatest show ever, and a row on the lake becomes a terrifying adventure. It seems that together, they can do extraordinary things, but what is their story, and how will it end?