Write a suspenseful short story about a woman who starts receiving mysterious messages from an unknown sender, detailing secrets that only she knows

Write a suspenseful short story about a woman who starts receiving mysterious messages from an unknown sender, detailing secrets that only she knows. As she delves deeper into the messages, she starts to fear for her safety and wonders if someone is watching her every move. The tension builds as she tries to uncover the identity of the mysterious sender before it’s too late.