Midnight Reynolds and the Phantom Circus — Catherine Holt

Twelve-year-old Midnight Reynolds is a middle-school student who works undercover for the Agency of Spectral Protection, helping ghosts cross over into the afterlife and saving her town from mishaps involving spectral energy. Now school's out for the summer, and Midnight and her best friend Tabitha just want to have fun. But their plans are interrupted when a mysterious traveling circus and a ghostly ringmaster come to town. As people start getting hurt, Midnight finds herself in the middle of her most deadly mission yet. Someone's stealing spectral energy from the living! Can they be stopped before it's too late?