2018. It's Niall's wedding day as he follows his estranged 'brother' Ruben into a barn, away from all his guests. Here, in an explosion of violence, Ruben brutally and shockingly attacks him. Understanding why proves to be the driving question of this drama as we are catapulted back through the decades.

1989. Niall is struggling at university when he invites Ruben to join him and his flatmates for freshers week. What begins with excitement ends in devastating consequences.