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.

Kayla places her tooth in a Tooth Fairy pillow, but it disappears before the Tooth Fairy has a chance to visit--can her dog King help Kayla find the missing tooth?

King & Kayla are back on the case in this laugh-out-loud mystery from the Theodor Seuss Geisel Honor Award-winning series.
Thor is in big trouble. Mr. Gary says he knocked over his trash cans, dug up his garden, and ate some of his vegetables. King and Kayla have to clear Thor's name and find the actual culprit.
Analytical Kayla demonstrates that Thor isn't big enough to knock over heavy trash cans and he doesn't like vegetables....

King & Kayla are back on the case in this laugh-out-loud mystery from the Theodor Seuss Geisel Honor Award-winning series.
Kayla needs to return her library books, but she can't find one of them. King knows that if they don't return all the books, they can't check out more—and that means no new stories.
Analytical Kayla retraces her steps, with the assistance of their friend Jillian. Sensitive King smells a library book. Could...

King and Kayla go on a sleepover adventure at Thor and Jillian's house, where they investigate spooky occurrences in the basement.