The Secret of the Shadow Bandit

"Kelsey's dad has a new job and that means a new house--on the same property as a castle! And this castle has its very own mystery. A valuable chess piece has gone missing, and Kelsey is determined to unmask the thief. But there's more than one mystery on the property. When a shadowy creature roaming the grounds leads Kelsey, Becca, and Leo to a secret clubhouse in a tree, they must work together to find out who used to meet there. Could the elusive creature be the key to solving both mysteries?" --