The mystery of the Zorse's mask

"The CCSC is back with another animal mystery to solve! Ever since they formed the Curious Cat Spy Club, Kelsey, Becca, and Leo have been perfecting their spy skills, from decoding messages to picking locks. So when a mysterious stranger arrives in town claiming to own Becca's beloved zorse, Zed the club is on the case! There's something suspicious about Caleb Hunter and the way Zed acts around him. Caleb seems charming, but Kelsey's not so sure. Could he be the one responsible for hurting Zed in the past? The club only has two days to figure out the truth about Caleb's past or Zed will be gone for good. Do they have what it takes? Or are they in over their heads?"--Jacket.