During the 2006 Northern Ireland peace talks, Sinn Féin leader Martin McGuinness (Colm Meaney) and Democratic Unionist Party leader Ian Paisley (Timothy Spall) are forced to travel by car together.
When Detective Mike Hoolihan is called to investigate the shooting of leading astrophysicist and black hole expert, Jennifer Rockwell, she is affected in ways she struggles to comprehend.
