So when an enormous white bear mysteriously shows up and asks her to come away with him, in exchange for health and prosperity for her ailing family, she readily agrees. The bear takes Rose to a distant castle hidden within a mountain, where each night she is confronted with a mystery. Every night she sleeps with an unknown being that she cannot see but she can hear shivering. She also makes friend with a being named Tuki the son of the cook who teaches her some of his language.