Mix Sellini never liked the number thirteen. But there are exactly thirteen steps leading to his apartment, which he has to climb several times every day. This pisses him off. He is in love with a fashion model who lives next door and follows her around like a shadow; and his small library in his rented room consists only of books dedicated to the famous serial killer Reggie Christie. The strange guy is disliked by the mistress of the house, who spent her whole life reading romance novels and still dreams of a young prince on a white horse. Both the landlady and the tenant live in their own strange worlds. But who said that these worlds are not capable of colliding with each other? It's not that difficult - just try on someone else's appearance and take thirteen steps down...