The Hum (2014)

Robin struggles with a double life - attracted to the strong, brusque state Senator whose campaign office she manages, and her love for her gentler husband, a failed writer who struggles to find employment. In his downtime her husband has become obsessed with a humming he hears, which he discovers is part of an international phenomenon. So enthralled is he with 'The Hum' that he actually cracks the mystery behind it. But nothing comes without a price as the answer opens up a world of greater horror for himself, his wife, and the world.