While searching for his mysteriously lost human family, Buddy the dog is adopted by another family and helps solve the mystery of their missing boy.

Investigating a classmate's claim that he saw a ghost backstage while rehearsing for the school play, Kaz and Claire, harboring suspicions that the ghost may be Kaz's mom, discover compelling evidence of otherworldly activities.

While attending obedience class with his new humans, Buddy the dog helps solve a mystery involving two pugs that were switched at the dog park.

A group of girls in Claire's town have noticed strange sights and sounds coming from the tree house where their club meets. Is it a rival boys club trying to scare them away? Or is it a ghost? The girls ask Claire to tackle the mystery--and Kaz hopes to finally find the rest of his missing family members!

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. The two join forces to solve the mystery of the ghost that's haunting the library. Could it be one of Kaz's lost family members?

"Kaz and Claire take a trip downtown, hoping to find Kaz's long-lost uncle. Instead, they meet a group of ghosts who live in the movie theater. But soon the ghosts start mysteriously disappearing! Who or what is chasing them away? And can Kaz and Claire bring the ghosts back?"--

Soon after Claire is called on to investigate a new case, her ghostly partner Kaz is reunited with his brother, Little John, who joins them in searching for the cause of strange phenomena that occur each afternoon at five o'clock.

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

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

"Join Marly, Isla, and Sai, three code-cracking kids on the hunt for an old neighbor's hidden treasure!"--Provided by publisher.