The whole sanatorium is on edge! People came to enjoy a quiet life, but instead they have to listen to the chilling howl coming from the forest, and stay awake at night, looking at the mysterious lights that flash between the trees. Only Musya rejoices - where there are secrets, there are adventures! In the midst of the general turmoil, she decides to follow Herman, with whom almost all the girls at the sanatorium are in love. Why is he hiding in the dungeons of the ruined count's estate? Go ahead, follow him! A boy named Samurai volunteered to accompany Musya. The adventure begins!