The third in a major new nine-part conspiracy thriller, starring Romola Garai. Written by Matthew Broughton. Following a mysterious phone call, the crash of Flight 259 is declared an accident. Nothing makes sense anymore. And, as Helen continues investigating Florian's fellow passengers, she uncovers another disturbing medical mystery. Is Florian somehow to blame for everything? And will Helen be able to find her father before someone more dangerous does? Tracks: A story in nine parts about life, death and the human brain. Original music by Stu Barker Directed in Wales by Helen Perry.