Lia and Cassie are best friends, wintergirls frozen in fragile bodies, competitors in a deadly contest to see who can be the thinnest. But then Cassie suffers the ultimate loss—her life—and Lia is left behind, haunted by her friend's memory and racked with guilt for not being able to help save her. In her most powerfully moving novel since , award-winning author Laurie Halse Anderson explores Lia's struggle, her painful path to recovery, and her desperate attempts to hold on to the most important thing of all: hope.