Enter the underground world of "thinspiration" websites. Seventeen-year-old Maddie has always felt a hole in her life, but she has finally found a way to fill it with her quest to mold her body into her ideal, thinnest shape. When she comes across the world of Pro Ana websites, where young people encourage each other in their mission to lose ever more weight, she realizes she is no longer alone. Finally, she has found a place where she is understood. Maddie quickly becomes addicted to the support and camaraderie she finds on thinandbeautiful.com. Now in a rehab facility where they are trying to "fix" a problem she doesn't think she has, Maddie is forced to keep a diary tracing how she arrived at this point. Angry that she is barred from accessing her online friends, Maddie resists therapy. Only when a tragedy befalls one of her comrades in arms is she shocked into admitting that she does need help.