The brand-new historical novel from the bestselling author of The Alice Network and The Huntress! *Winner of Historical Novel of the Year in NetGalley UK's Books of 2021* 'A terrific book bursting with vivid atmosphere' Dinah Jefferies, #1 bestselling author of The Tea-Planter's Wife 'Wonderful...A hugely satisfying and thrilling read' Fern Britton, #1 bestselling author of Daughters of Cornwall 'Immersive, thrilling and packed with wonderful characters...I absolutely loved every page of this incredible book' Jill Mansell, bestselling author of Maybe This Time 1940, Bletchley Park, Buckinghamshire. Three very different women are recruited to the mysterious Bletchley Park, where the best minds in Britain train to break German military codes. Vivacious debutante Osla has the dashing Prince Philip of Greece sending her roses - but she burns to prove herself as more than a society girl, working to translate decoded enemy secrets. Self-made Mab masters the legendary codebreaking machines as she conceals old wounds and the poverty of her East-End London upbringing. And shy local girl Beth is the outsider who trains as one of the Park's few female cryptanalysts. 1947, London. Seven years after they first meet, on the eve of the royal wedding between Princess Elizabeth and Prince Philip, disaster threatens. Osla, Mab and Beth are estranged, their friendship torn apart by secrets and betrayal. Yet now they must race against the clock to crack one final code together, before it's too late, for them and for their country. If you loved The Crown, don't miss this riveting historical novel!