Callum O'Connor believes that he is entitled to his former wife, Lisa's, inheritance. Her new business venture, The Pen and Pastry, that she shares with her two friends, Tanya and Rita, is under threat as Callum unleashes his fury. After several failed threats, he enlists the help of petty criminal, Billy Turner, to kidnap Rob, their employee, a young student baker. After leaving Rob for dead, he flees to his childhood home, Belfast, where his sister Siobhan, reluctantly finds him a place to stay in the Mourne Mountains. DS Short and DC Baker track him down and the chase begins.