A propulsive literary page-turner about a family torn apart by a mother’s obsession with a sound that no one else can hear One night, while lying in bed next to her husband, Claire Devon suddenly hears a low hum. This innocuous sound, which no one else in the house can hear, has no obvious source or medical cause, but it begins to upset the balance of Claire’s life. When she discovers that one of her students can also hear the hum, the two strike up an unlikely and intimate