Princess Celia is the youngest in Siyanne Castle, and everyone knows that the castle loves her the most. When the castle gets bored - and this usually happens on Tuesdays - it begins to live according to its magical laws, moving and even completely rearranging some rooms. One of Celia's favorite pastimes is exploring the castle, drawing up plans for new rooms and finding secret passages and staircases. And these skills will be very useful to her when trouble comes. The king, queen and eldest prince will go missing, and the castle will be at the mercy of traitors. And only Celia will be able to protect her home and save the kingdom! For the first time in Russian!