Twin sisters

Elizabeth and Isabel hadn't seen each other since thier parents divorced when they were three. Isabel stayed with her father, a brilliant and reclusive author. Elizabeth ended up with her mother, a jet-setting socialite who hopscotched her young daughter all over the world. Then Isabel is murdered--and her twin wants to find out why. Because she was out of town when it happened, Isabel's friends don't know she's gone. And if Elizabeth has her way, they'll never find out, Only Elizabeth will know--and the killer.