Devastated by the death of her friend, Ragweed, Poppy once again journeys through the vast and dark Dimwood Forest to bring the tragic news to Ragweed's family. But when Poppy and her prickly pal, Ereth the porcupine, arrive, they find Ragweed's family already in turmoil. The quiet serene valley where Ragweed lived has been flooded by beavers, and the mice have been forced to move for fear of drowning. Together Poppy and Rye, Ragweed's brother, face kidnapping and imprisonment, near death and a daring rescue to fight the beavers. Will they succeed? And will Rye manage to step out of Ragweed's shadow and prove himself worthy of Poppy's love?