Maggie Brooklyn is distracted from solving the mystery of who is out to sabotage the new sweet shop in the neighborhood because her new dogsitting job has her and her twin brother Finn spending time in what may be a real haunted mansion.
As the school talent show nears, Annabelle's plan to display her dog training skills goes awry and she is asked to be a student judge instead, which seems perfect until her friends begin asking for special treatment.