The letter

A girl have been receiving letters since her birthday.Those letters had started very friendly but became to hide a big secret.On every letter there is a date and a place,that lead to a crime scene that happen when the girl step in the place.Who send those letters?Why the letters are for that girl.What does she have that is special?

Sorry for my bad English and my mistake.English is not my first language but I try to make the less mistake possibles ^^