Alice, Sweet Alice (1976)

Alice Spages is a withdrawn 12-year-old girl who lives with her younger sister Karen and their mother Catherine. Karen gets most of their mother's attention, and Alice is often left out. When Karen is found brutally murdered in a church before her First Holy Communion, Alice is thrust into the spotlight of suspicion, but is a 12-year-old girl really capable of such savagery? As more people die at the hands of a merciless killer, Alice's family and the police don't know what to believe.