Pure Dead Brilliant

Near his thirteenth birthday, Titus Strega-Borgia is about to become a millionaire, but the family's old mansion is already bursting with trouble when his mother's student-witch classmates arrive for a visit. One of the guests looks suspiciously like a foul-smelling, soul-harvesting demon with a hidden agenda, and a mysterious vision on the family laptop predicts a dire future for the siblings. To make matters worse, Titus's scheming Uncle Lucifer is back, intent on snatching the Borgia fortune for himself. As magic, monsters, and a looming inheritance clash, Titus and his sister Pandora must untangle the supernatural chaos and protect what's left of their family's legacy.