Ariel — Lawrence Block

Ariel Jardell, an adopted twelve-year-old girl is possessed … her mother thinks … by jealousy and by forces far more bizarre. And as the reader will discover, Ariel is driven to a precocious excursion from mischief to malevolence and beyond. An unnerving tale woven together with a fascinating, terrifying child at the center of each twist and turn it takes, Ariel gives new definition to the age-old conflicts of good verses evil, sane versus insane.