Thewlis Mohan is a train driver who has to come to terms with killing an unknown man who falls under his train. This takes him on a journey, searching not only for the one-under's identity but to understand why he would have committed suicide. This is what the Police claim but he's not convinced and thinks he was in fact murdered. And with this, as well maybe... Thewlis' incongruous journey reminds him of the past and recaps an incident that happened to his mother when she lived in India and how it changed her direction in life. As things proceed, incidents become intertwined with his brother Saul who has also disappeared and could in fact be linked to the one-under. Thewlis wants answers and he finds them.