The Rose Code is a New York Times and USA Today bestselling historical novel by Kate Quinn, published by William Morrow (HarperCollins) in March 2021. This sweeping 656-page work follows three women codebreakers at Bletchley Park and is widely acclaimed as one of Quinn's finest novels alongside The Alice Network and The Huntress.

Set in 1940, three very different women are recruited to the secret country estate of Bletchley Park, where Britain's brightest minds race to crack German military codes. Osla, a vivacious debutante with connections to Prince Philip of Greece, puts her fluent German to use translating decoded enemy messages. Mab, a fiercely self-made product of east-end London poverty, operates the legendary codebreaking machines while guarding painful secrets and searching for a better future. Beth, a shy local village spinster whose quiet exterior conceals a remarkable gift for puzzles, blossoms into one of Bletchley Park's few female cryptanalysts. Bound together by secrecy and purpose, the three form an intense friendship—until war, loss, and betrayal tear them apart.

In 1947, as post-war Britain erupts in excitement over the royal wedding of Princess Elizabeth and Prince Philip, the three estranged friends are drawn back together by a cryptic encrypted letter. Its key lies buried in the long-ago betrayal that shattered their friendship and left one of them confined to an asylum. A traitor from their Bletchley Park days has resurfaced, and Osla, Mab, and Beth must rebuild their broken alliance to crack one final code—each petal they remove from the rose code bringing them closer to danger and to their true enemy.

The Rose Code is a 2022 Alex Award winner, available in paperback, hardcover, ebook, audiobook, large print, and audio CD formats. ISBN: 9780062943477 (paperback).