Bella wants to learn how to play a musical instrument but can't seem to decide which one. Kobi, Sam and Mali try to help her choose by exploring the many different instruments that exist but there's one particular sound that is inspiring Bella. The only problem is no one knows what the sound is, or where it's coming from.

The children of Apple Tree House learn about taking responsibility as they help to tidy some mess on the estate. When Flo notices a lifeless patch of ground outside her cafe, the children make it their responsibility to fix it and make it more beautiful.

When the residents of Apple Tree House find themselves surprisingly low on milk, they start to wonder where it's all going. After a bit of investigating, all clues point towards Bella, Sam and a furry little stray cat that they've found.