Write a suspenseful story about a woman who receives a mysterious package on her doorstep, only to find that it contains clues to a dark secret from her past

Write a suspenseful story about a woman who receives a mysterious package on her doorstep, only to find that it contains clues to a dark secret from her past. As she unravels the mystery and confronts her demons, she realizes that her life is in danger and must race against time to protect herself and those she loves.