Rosie lives in a playhouse with her colourful group of friends. Together they embark on adventures as they learn the meaning of true friendship. It's night time and no one can get to sleep! There's a deep rumbling noise coming from outside. Whatever it is, it's keeping everyone awake, so much so that Big Bear and Bluebird go to Rosie's house. Now Rosie must find out what it is so, along with Raggles, she sets out to discover where the mysterious gurgling sound is coming from.