Prism - Faye Kellerman, Aliza Kellerman Brilliant book about three teens who manage to stumble into a parallel universe where the theory of evolution and natural selection is taken a little too seriously. In others words, those who get sick will get better through natural means, medicine is banned, and if they don't survive than that means it was meant to be and the strong will live on. Can the trio managed to get back home and help save this messed up world? Or will they be forced to choose?