Book excerpt: When Max Monroe discovers an old detective agency in his grandfather’s backyard, he uncovers a spooky secret: the ghost of his great-uncle Larry! Larry was a bumbling detective who never solved one measly case in his entire career. Max loves mysteries, so when a new case comes their way, he and his uncle team up to help find a missing birthday girl. Can they rule out the many suspects — including a clown and a practical joker — before the girl’s mother comes home?