She strikes up a friendship with one of her students who can also hear the hum. No one in her house can hear it, and this sound has no obvious source or medical cause, but it starts upsetting the balance of Claire's life.
In the novel The Listeners, Claire Devon is one of a disparate group of people who can hear a low hum. (Yuula Bernivolski, HarperCollins Canada) The Listeners is a novel by Jordan Tannahill.