Who sent me a letter?

Waking up on the eve of his birthday, Sophie saw a stranger at the bed.
He handed her a sealed envelope and ordered her to open it tomorrow at the holiday, exactly eight in the evening, surrounded by relatives and friends. And he threatened that if Sophie violates the order, not only her will suffer, but her mother and sisters ...
The man disappeared as suddenly as he appeared, and Sophie panicked. Maybe this is some kind of mistake or a stupid draw?
But who sent her a bouquet the next day? And who pursues her on the heels on a white car? .. Sophie is convinced that the stranger is closely watching her every step, and understands: his threats are not a joke at all. time to find out who sent her a letter and why and why