The story of a hum that has been keeping the people of Omagh awake for months. With the town exhausted and exasperated, local journalist Emmet McElhatton wants to get to the bottom of a mystery fast making headlines around the world. In the journalist’s search for answers, he meets local repairman Jamie Ryan, who has started his own investigation into the elusive sound. Together, they make their way around Omagh and try to solve the mystery.