The life of the Englishwoman Caroline has cracked: her career did not work out, her fashion designer husband defected to the American pop diva, taking her son away from her, and to top it all off, her dearly beloved great-aunt Letty died. While sorting out the deceased's things, Caroline discovers among them a bunch of mysterious keys and drawings with views of Venice. What connected Letty, a seemingly convinced spinster, with the “city of lovers”? Carolina decides to take a trip to Italy and instantly finds herself drawn into a mysterious and romantic “quest”. Step by step, Letty's turbulent past, her great love, the bitterness of loss, and her dangerous espionage activities behind enemy lines during World War II are revealed to Caroline. The search brings Caroline together with a very charming count, and at first it is difficult to understand whether he is her friend or foe. 16+