Walker: The Mystery of the Missing Millions - Shoo Rayner - Bog

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.