When lorry driver Dougie Alport carries out a deadly attack on his employers head office, the reverberations of his actions unleash a grief in his wife Maureen that threatens to reveal the secret she has spent years hiding from their son, Boyd. Moving north to start again is Maureens best response. But as the walls begin to throb with mould and his mother slips from his grasp, Boyd decides to flee, finding solace with a new friend at the landfill site on the edge of town. Here, a startling discovery upends Boyds new life and forces him into a reckoning with his mother, her past, and his future.