Hotel; night; Italy; year 1748th. The main character is Giacomo Casanova, twenty-three years old, authentic, extracted from the fourth volume of his own memoirs and supplemented by a female dream about the eternal Casanova, sleeping, dropping female names from her lips. Hussar Henry interrupts his restless dream, at first glance - a young mischievous angel in a uniform. Casanova in excitement: “Are you a creditor? Are you a thief? You are worse: / You are someone's husband! No, good for a husband. / Why are you here? Why on the bed / Descends this moon ray? " Dialogue, like moonlight, interweaves whimsical rhythmic patterns. The famous hero-lover is blind from sleep, and the night visitor is forced to open himself: “Henri-Henrietta” ... Casanova flashes with a hasty love fire. A frivolous (for the time being seeming frivolous) angel opens the window.

Next evening. Casanova is persistent, Henrietta is evasive, he is enthusiastic, she is mockingly mocking: “I have never loved so passionately, / I will never love like that ...” With the help of the talkative modistes, the hussar is transformed into a brilliant lady. The question quietly creeps in: “Who are you?” “The Mystery.” ... Whoever she is, she is perfection. Filled with subtle charms; courteous by that exquisite courtesy that reigned in the enchanted world of castles and parks; witty, smart; as musical as the music itself - it conquers all the brilliant guests of the aristocratic Parma villa, where the hunchback owner, an occasional acquaintance, gives a reception in her honor. The orchestra easily drops the "pearls of the minuet", silk threads of thin speeches are carelessly woven, when suddenly: "Sent to you with a letter. / - AND! Seven Seals! / Casanova. / My love, we must part. "

Last farewell - at the "road collapse", in the hotel "Scales". Casanova in anguish prays to stay with him even for a short while, she is adamant - why? The atmosphere of mystery is thickening ... She will throw the ring, which he didn’t take back into the night, but before that she will draw some quick words on the glass with a diamond face - a note to the future that Casanova, captivated by despair, will not pay attention to ... But in fact, why is separation so inevitable? Why should she leave? Who is she finally? Maybe came from another century? No wonder she knows the future: “Someday, in old memoirs, / You will write them completely gray-haired, / In a godforsaken castle in a foreign land ...” Maybe the moon Henrietta is Tsvetaeva’s lyrical mask, her dream of herself: the mistress hearts that seduced Casanova? "I swear to you that I will dream!"

... Thirteen years later, in the same room of the same hotel, Giacomo brings his thousand and first girlfriend. She is seventeen years old, she is charming, poor, greedy - for money, sweets, carnal joys. He is still Casanova, but already as a household: a professional lover who does not flare up with heartfire, but only glows with bodily heat ... The moon rises outside the window, lights up the words scratched on the glass: "You will forget Henrietta ..." Stunned: "Or am I blind? " - the explosion, passion, instantly the former Casanova is filled with the former violent despair. The girl in fear and tears, wants to run. But the passionate storm subsided, Casanova has already returned from the past, is already ready to have fun with the first thousand ... And the comforted beauty, of course, can not restrain her curiosity: “What are these letters?” “So - the one and only - adventure.”