This show is an extremely well observed, nuanced portrayal of someone who feels lost and is seeking a different way of life. Suffocated by her choices, Claire (played by the exceptionally talented Rebecca Hall) begins hearing a sound she can't escape while living a life defined by her role as a teacher and mother.
The 'hum' leads her down a dark path, away from those she loves to find connection elsewhere, amongst other lost people struggling to cope in mainstream society. All in all I found this a very poignant study that brings up questions around mental illness, reality, convention and the drive that makes someone abandon those they love.