Nick Bishop, while writing a profile of a new mindfulness app, hears a chilling voice within one of the soothing songs on the app - and nightmares follow. Then Nick discovers that of the twenty people who have heard this sinsister song before, he is the only one who is still alive... Desperate for work, Nick Bishop takes a humbling job: writing a profile of a new mindfulness app. But when a song on the app gives him endless nightmares that start to permeate his waking life, he learns that he's the only one to have heard this and survived...