Vice Versa by Mary Christian is about the fine line between sanity and insanity that we all walk. Almost all characters in this intriguing novel exhibit contrasting facets of their personalities, but the protagonist, Connie O'Hara, is by far the most conflicted victim as well as perpetrator. As a child, shy and withdrawn Connie is molested by her father. During this time, an alternate personality called "Sonny" begins to emerge. Sonny is everything Connie isn't: confident, outgoing, flirtatious, and homicidal. As a trail of dead bodies begins to emerge, detective Frank Vinucci faces the challenge of capturing the murderess that haunts the far corners of Connie's mind.
Sonny's audacity culminates in an exciting contest of will and ingenuity. The most fascinating aspect of the novel is the method the author used of incorporating the internal conflicts of each character, emphasizing the volatile components of the human psyche. As readers we are led into our own roles as amateur psychologists, analyzing the motives of each character as the story progresses, and finally facing our own internal conflict. Is Connie guilty or innocent?