The Spy Club explores Kelsey's new house, finding an abandoned tree house, a wad of cash, a missing heirloom, and a mysterious creature roaming the grounds.

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 mig

When Kelsey and her friends find an abandoned pug puppy, it looks like another case for the Curious Cat Spy Club. But shortly thereafter, Kelsey's mother goes m

Kelsey can't resist collecting secrets in her spy notebook just like her hero, Harriet the Spy. When she learns Leo has been hiding something from the group, sh