What would you do if there was a school competition to make a dragon that can fly? Ryan always wins everything, thanks to his incredibly competitive dad. Ryan will have the state-of-the-art gadget like always. Harri would love to know what it feels like to win, just once, but there's no chance. And then someone new walks into Harri's mum's shop. Someone 'almost' invisible.

Ryan's dad is out for revenge. He knows there is a secret about Tan, Harri's supposedly 'toy' dragon. Ryan, Harri's new best friend, knows Tan is real and his dad forces him to give the secret away, testing Harri and Ryan's friendship to the limit.

Ten-year-old Walker isn't allowed a dog of his own, so he walks other people's. When crooked billionaire, Arlington Wherewithal goes to prison, his wife, Jazaminta, asks Walker to look after his dogs. But then Walker finds out that a gang is trying to make Jazaminta tell them the hiding place of Arlington's missing millions.