Dori Hillestad Butler

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?

A lovable dog helps his human girl solve a mystery. Thor has been accused of wrecking Mr. Gary’s yard, knocking over trash cans, eating the vegetables out of the garden, and pooping. But King and Kayla, with the help of some other neighbors, are determined to clear his name, using a wide variety of familiar and new detecting skills. With simple, straightforward language and great verbal and visual humor, the King & Kayla series from Geisel Honor...

King & Kayla hunt for Asia's missing gold ring.

Buddy the dog discovers a strange, blue-tongued creature in the school library, and investigates what it is and how it got there.

"Kayla needs to return her library books so that she can check out new ones. But she can't find one of them. Where could it be? Can King and Kayla's friend Jillian help?"--Publisher.

"When ghost boy Kaz's haunt is torn down and he is separated from his ghost family, he meets a real girl named Claire, who lives above the town library with her parents and her grandmother. Claire has a special ability to see ghosts when other humans cannot and she and Kaz quickly form a friendship."--Amazon website.

Dog-and-human detective duo, King and Kayla, must try to figure out how Raj's cat escaped from a locked house.

When Buddy goes to school to become a therapy dog, he ends up helping figure out who pulled the fire alarm instead.

Buddy the dog risks everything when he leaves his new family to investigate what happened to Kayla and her father, his beloved former owners, by slipping into a van Kayla's uncle is using to empty her house in the middle of the night.