Each day, Rusty feeds a dog that's left chained in the frigid weather with no shelter and no food or water. When he realizes that the dog's been injured, Rusty and his friend Andrew unchain the dog and take it. Are they stealing, or are they rescuing a dog in need? With the dog living in their secret hideout, the boys face multiple challenges, including a mysterious ghost dog that tries to lead them to a startling secret, Andrew's snoopy sister, and the escalating threats of the dog's abusive owner. The fast-paced suspense builds to a surprising conclusion, which will leave young readers cheering for Rusty's compassion and determination.