During World War II Nathalie Lily Sergueiew, a woman of mystery, confidently seduced the German Intelligence Service into employing her as a spy against their British enemy. Little did they know that this striking woman - who turned heads when she walked into a room with her little dog Babs - would in reality work with their enemy against them. Her diary chronicles her years as a double agent for the British from 1940-1945 under the code name Treasure. From the moment she conceived the idea of becoming a double agent, Lily faced challenges on two fronts: first, she had to convince the Germans to ask her to spy for them; second, she needed the British to believe her story. Only then could she begin the perilous work of helping free her homeland - France - from the German occupier.