The rewards for each season include unique furniture for one of the rooms in the Manor. It can only be obtained if you have a Detective Pass.
When a season ends, this furniture can be purchased for diamonds under the following conditions:
  • The season diary is available for re-reading and purchase;
  • You decoded the diary in full during the event or as a result of a purchase.
If you meet these conditions, then you can buy furniture by opening the interface for furniture editing in the room. The seasonal furniture of the season is easily recognizable by the “pages” icon and the diary title.