While Bennie is the "good sister," Alice is the evil twin, full of ways to cause harm and sadness to others. While the two grew up separately, in adulthood Bennie has to deal with Alice, first by defending her against a murder charge. When Alice comes back into Bennie's life this time, she drugs her sister then buries her alive and then tries to assume her identity in order to get at Bennie's money. Alice is able to fool everyone in Bennie's life, and when Bennie finally breaks free and tries to resume her identity and put Alice away no one is sure who to believe. The two are identical and Bennie's story seems rather implausbile.