After Brigid Lowe’s world is upended, she determines to swim Scotland’s thirty thousand lochs. She steps into ice and caves and sacred springs; she swims with birds, conger eels and seals, amid forest and mountain and moor, alone and with her children in tow. As she walks the line between recklessness and safety, she discovers new edges of pain and pleasure, of strength and endurance. These are the chill waters which swept Brigid off her feet only to carry her back home again.