Scepter of the ancients / Landy, Derek

Stephanie, bequeathed a mansion by her uncle that comes complete with a supernatural skeleton detective, finds herself acquiring magical powers and embarking on a quest to keep the powerful Scepter of the Ancients from falling into the hands of the evil Faceless Ones--while keeping everything a secret from her parents.

When twelve-year-old Stephanie inherits her weird uncle's estate, she must join forces with Skulduggery Pleasant, a skeleton mage, to save the world from the Faceless Ones.