Hazel, our protagonist, has a little brother called Fiver. Fiver often has prophetic visions, and one day he has a particularly horrifying one in which he foresees the total destruction of their warren. Hazel and Fiver try to warn their leader, but he doesn't believe them. However, Hazel and Fiver form a plan to leave the warren, and after finding as many rabbits who agree to accompany them as they can, that's exactly what they do. ...suddenly realize that they didn't bring along a single female.