Mysterious-horror Stories

This short novel centers around the story of Izabella Klokova, the protagonist. Her father Anton disappeared mysteriously, leaving no trace behind. She last saw him when he left for a mansion to conduct research. Despite the police's efforts, they couldn't locate him. So Izabella took it upon herself to investigate and went to the mansion hoping to find a clue. However, she stumbled upon something unexpected, which ultimately led to life-changing consequences. What did she uncover? Did she find her dad? What was the truth behind his disappearance?