Eighteen-year-old Rosa’s nerve disease is slowly killing her, so when a doctor from Boston chooses her as a candidate for an experimental brain transplant, she and her family move from London in search of a miracle. Sylvia - a girl from Massachusetts - is brain dead after having fallen into a frozen lake, and her parents have agreed to donate her body to give Rosa a new life. But Rosa’s curiosity about Sylvia becomes a haunting obsession. After months of rehabilitation she embarks on a road trip with Joe, a boy she met in the hospital park, in an attempt to find closure and figure out who she really is.