Singleton, Linda Joy. Curious Cat Spy Club #bk. 4

Kelsey's dad has a new job and that means a new house-on the same property as a castle! Kelsey, Becca, and Leo can't wait to explore, but what they find might lead to their most intricate case yet. How are an abandoned tree house, a wad of cash, a missing heirloom, and a mysterious creature roaming the grounds all connected? The Curious Cat Spy Club is determined to find out!

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