Through a series of letters, snobby cat Simon and good-natured dog Baxter team up--sort of-- to find Andy's missing school pet Louie, the leopard gecko.

When one of Kayla's library books goes missing, King and Kayla's friend Jillian must help her solve the crime.

When King's favorite blue ball goes missing, he and Kayla must put together clues to figure out where it went.

Through a series of letters, Simon, a grumpy and jealous cat, and good-natured Baxter, his boy's dog, discuss the upcoming parade in which Baxter will participate for the first time.