Summer is not forever. Knyazeva A., Knyazeva K.

For a year now, Ulyana Zheleznyak has been working as the director of the Orion boarding house. Suddenly, an emergency happens: the guest disappears without a trace. In his car, left on the territory of the boarding house, there are ancient tiles. Meanwhile, the same tiles are found in the apartment of the murdered collector, laid in the mysterious puzzle...

Ulyana Zheleznyak investigates this case with investigator Bogdanov, but their confusing relations complicate the unraveling of difficult puzzles. Gradually, they understand that the traces of the crime lead to the abandoned manor of the Tish-on-Tusk, in which mysterious light is on at night...