It all started with a lost letter that had been searching for its addressee for many years. It was from him that Edith Burchill learned about Milderhurst Castle. His owners, three sisters, sheltered his mother Edith during the evacuation. However, now she does not want to tell her daughter about her life in the castle, and she is sure: there is some kind of secret hidden here. Having arrived in Milderhurst by chance, Edith found there “The True History of the Slush Man” - a book that determined her fate in early childhood . Its author, Raymond Blythe, once lived here, and his daughters are the same three sisters! — still live on the family estate, surrounded by dense forest. Well, how can you resist and not go to the castle to find out what secrets its ancient walls hide?..