A magnificent English detective in the entourage of a mysterious and sinister boarding school. The story of twin sisters who have to figure out the secrets and mysteries of their educational institution.

Since the silent and shy Rose came to our school, my sister and I have been tormented by the question, who is she? What secret is hidden by this girl without a past, who has retained only a golden pendant and ... the ability to handle horses from her former life. And then we had a chance to solve this riddle - we went to the hotel by the lake as a whole school! But it turned out that not only Rose keeps secrets. The dark waters of the lake are also full of secrets. Someone comes out of it at night and wanders around the hotel, leaving wet footprints on the floor and scaring the guests. And in the evenings, if you look closely, you can see the lights in the depths of the lake.