When a mysterious letter written in code arrives at King's house for his human, Kayla, he follows the trail of the person who left it.

Dori Hillestad Butler has published magazine stories, educational materials, plays, book reviews, characters for a board game, and over sixty children's books. A two-time Geisel Honor Book winner for King & Kayla and the Case of the Missing Dog Treats and King & Kayla and the Case of the Lost Tooth, she has also been nominated for children's choice awards in nineteen different states and won the 2011 Edgar Award for the best juvenile mystery for Buddy Files: Case of the Lost Boy. She lives in Washington.