At first, 13-year-old Christina Blumstein thought she had an ordinary headache. She and her parents were returning from a visit to Long Island in July 2014 when the pain struck. Was it a bout of carsickness? Too much screen time on her iPad? But a few hours later, back home in Old Bridge, New Jersey, her mother MaryAnn says, "Christina started screaming that somebody was stabbing her in the head with a knife." Soon afterward Christina was comatose and in an ambulance - and her life was in grave danger.