The Secret of the Empty Apartment

Dasha and Stas are about to move soon! And while their parents are on vacation, the kids decided to give them a wedding gift. They will renovate the new apartment themselves, with the help of their close friends. But they don't yet know that a new investigation awaits them. After all, someone is visiting the empty apartment... And Petya Kvitko will once again have to risk his life. But that's not all! They will have to solve a real crime: they can't just ignore their new friend Inna in need...