When Claire starts hearing an incessant rumbling sound, nobody seems to be able to help, until her student Kyle claims to also hear the noise.

Claire and Kyle discover a group of other people who not only can hear the hum but want to embrace it. However, Kyle's mother finds out about their meetings.

Unable to experience the hum the way the others can, and increasingly guilty about her relationship with Kyle, Claire has a crisis.

An English teacher finds herself being mentally harassed by a continuous humming noise that only a few people seem to hear.

Siobhan turns up at Jo and Omar's house, demanding they send Kyle out. When the group refuse to cooperate, she calls the police.