"Embark on a thrilling adventure through time with 'The Shadow Key', the latest historical mystery from the #1 Sunday Times bestselling author.

It is 1940 and the world is at war. In the midst of this chaos, a mysterious cryptograph is stolen from the British Intelligence headquarters in Cairo. The thief, known only as "The Shadow", leaves behind a cryptic message that reads: "The answer lies in the shadows".

Enter our protagonist, a brilliant cryptologist named Sarah Pearse, who is tasked with deciphering the stolen cryptograph and uncovering the secrets it holds. As Sarah delves deeper into the mystery, she finds herself entangled in a web of espionage, deceit, and betrayal that stretches from the deserts of North Africa to the streets of London.

With her sharp mind and quick wit, Sarah must navigate the treacherous landscape of 1940s espionage and uncover the truth behind the Shadow's cryptic message. But as the stakes grow higher, Sarah begins to realize that she is not the only one searching for the truth. The Shadow is still out there, watching and waiting, and Sarah must use all her skills to stay one step ahead.

Packed with suspense, intrigue, and historical detail, 'The Shadow Key' is a gripping and unputdownable mystery that will keep you on the edge of your seat until the very end. With its unique blend of cryptography, espionage, and historical intrigue, this book is a must-read for fans of Dan Brown, Charles Cumming, and Robert Harris."