The Fell by Sarah Moss

At dusk on a November evening in 2020, a woman slips out of her garden gate and turns up the hill. Kate is in the middle of a two-week quarantine period, but she just can’t take it anymore. The moor will be deserted at this time. Nobody need ever know. But Kate’s neighbour Alice sees her leaving and Matt, Kate’s son, soon realizes she’s missing. Kate, who planned only a quick solitary walk - a breath of open air - falls and badly injures herself so what began as a furtive walk turns into a mountain-rescue operation.