Crake constructs a new genetically engineered human race to live more “in harmony” with the earth and each other by removing the human propensity for violence, meat-eating, religion, etc. etc. Unfortunately, a lot of those are a more intrinsic to the human makeup than Crake originally guessed. The Crakers are alone, in a world they can no longer understand now that Crake has taken science away from them. The only connection they have with the old world is Snowman, so naturally they go to him for answers.