The breathtaking new novel from the bestselling author of the Richard and Judy Book Club pick The Midnight House.

In Ireland, Maggie has grown up hearing her mother tell her the bedtime story of The Glass Key. It's a Nordic fairytale passed down by Maggie's grandmother Anna Swan, who mysteriously left her home one stormy night years ago, never to return. Now Maggie's grandfather has died and going through his things, Maggie is shocked to discover a faded wartime letter, asking him to take in a baby. In that moment she realizes that Anna Swan was a woman of many secrets. Only by traveling to Norway and discovering the story of four brave young women whose lives were forever changed by the occupation of their tiny islands, can Maggie uncover the shocking truth about her family - and finally unlock the mystery of the glass key...