Midnight Reynolds and the Agency of Spectral Protection — Catherine Holt

Twelve-year-old Midnight Reynolds has a huge secret -- she's a spectral protector, someone who helps ghosts cross over into the afterlife. Alongside her best friend Tabitha, Midnight is busy juggling the wilds of middle school with her undercover ghost-hunting job. When mysterious and dangerous robberies start happening in their small town, all signs point to some sort of spectral manipulation, and Midnight's boss asks her to take over the investigation. Can Midnight find the culprit and stop them before the spectral energy endangers their town?

This series has twists and turns galore for budding mystery lovers, all seen through the lens of a lovable and smart heroine. And the positive female friendships and hysterical writing will keep series fans coming back for more.