The fifth in a major new nine-part conspiracy thriller, starring Romola Garai. Written by Matthew Broughton

Confined to her hospital bed, Helen is desperate to continue her investigation into the plane crash and find her missing father, Florian. But with the mystery child locked in a coma upstairs in the same building, is Helen safe?

Where is Florian Chauvin? What did he do to the little boy? And is Helen on the right drugs?

Tracks: A story in nine parts about life, death and the human brain.

Helen…. Romola Garai

Original music by Stu Barker

Directed in Wales by James Robinson