Writer Everly Bainbridge's life is left in ruins when her husband takes their child to the supermarket one day and a lorry collides with their car. After the accident, a lawyer appears on her doorstep and tells her her husband was not who he said he was and she is a very rich widow. She retreats to a lonely house in the countryside to recover. But there’s a well in the cellar, a spectacularly cold room, and one night, Everly wakes up with a foot hanging over the emptiness of the well and the echo of her daughter’s voice in her ears