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.

Sam and Bella are excited about an upcoming bike riding challenge at school, but Mali feels left out because he doesn't know how to ride. Will Mali admit the truth to his friends? And how is he going to participate?