Daisy Hubbard is a genetic researcher with a mission in life - finding a cure for the rare condition that killed her brother at the age of six. But it's her schizophrenic sister, Anna, who concerns Daisy now - Anna has gone missing from her home in Los Angeles, and bloodstains have been found in her apartment. Daisy flies from Boston to meet LAPD detective Jack Makowski - and learns that a serial killer has confessed to Anna's murder. He will only reveal the location of the body if he can lead Daisy to it himself. But the first body he takes her to isn't her sister's. Nor is the second. Could Anna still be alive?