Tommaso, Cate, Rigazzi, Brino and Greta share an apartment in Via Tiburtina 63. At home only one rule reigns supreme: it is strictly forbidden to weave sentimental relationships between roommates, on pain of paying five months of bills for everyone. One evening, the apartment swoops in the dark due to a blackout. The electronic lock of the entrance door is blocked, so, prisoners in the house until the next morning, the boys decide to indulge themselves a few slices of the “magic” cake prepared by Tommaso. Only the light of day will reveal that perhaps someone has violated the rule during the night. Who? and why?