Rosie lives in a playhouse with her colourful group of friends. Together they embark on adventures as they learn the meaning of true friendship. All Oakley wants to do is join in with his friends' game of hide-and-seek. There's just the small issue of Oakley's enormous size and obvious visibility. Not even a touch of Bluebird's magic can help hide Oakley, so Rosie, Raggles and their friends set about trying to make Oakley disappear. Will they succeed in making him just a little bit invisible?