It is June 1940 and fifteen-year-old Olivia Baldini's idyllic English life is shattered as Britain declares war on Italy. With hyperthymesia, Olivia possesses an extraordinary ability to recall information with vivid detail, a gift that makes her invaluable to Churchill's secret sabotage army, the Special Operations Executive (SOE). Trained in nursing, coding, and espionage, Olivia is dispatched behind enemy lines in Italy, aiding partisans and resistance fighters. Nino Fabris, dreaming of world travel with the Merchant Marines, is thrust into the war when his ship is conscripted. Captured in North Africa and sent to a POW camp in Kenya, Nino seizes a chance for freedom by joining the SOE. Sent to London for training, he briefly crosses paths with Olivia, igniting a spark that persists even as he is deployed to Cairo. In the chaos of war, Olivia and Nino's paths intertwine, leading them through perilous missions and clandestine operations. Despite having loved ones waiting back home, the undeniable connection between them grows amidst the dangers they face. Together, they navigate the treacherous landscape of war, where survival is uncertain and every memory could be their last. The Cipher is a gripping tale of love, resilience, and the power of the truth--and who you trust with it.