A teacher and her student are the only people who can hear a constant humming sound. Plus: the semi-finals of The Great British Bake Off. Here’s what to watch this evening

9pm, BBC One
A curious new drama – from the producers of Normal People, The Favourite and Poor Things – that will have you guessing throughout and leave you with a phantom buzzing in your ears. Rebecca Hall is Claire, a teacher, wife and mother who one night notices a low-level humming noise that doesn’t go away. It’s not tinnitus and the doctors are stumped, which leaves Claire feeling isolated, exhausted and acting oddly towards her family. Some relief finally comes in the form of her student Kyle (Ollie West) confiding in her that he also hears “the Hum”. They team up to get to the bottom of it – but what and who will they find on the way? And will there be a logical explanation? Hollie Richardson