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?

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.

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

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

Tired of being told what to write by the school newspaper's advisor, Zibby and her friend Amr start an underground newspaper online where everyone is free to post anything, but things spiral out of control when a cyberbully starts using the site to harrass one popular girl.

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

King the golden retriever struggles to communicate with his human, Kayla, as both try to clear Thor of having trashed Mr. Gary's yard.

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.

When strange noises are heard in the tree house where their club meets, Claire and Kaz wonder if a rival club is causing problems in order to scare them away, or if they are coming from the ghosts of one of Kaz's departed ancestors.