China Doll Story (First Incarnation)
the ghost story begins with a child (usually named Emily) who convinces her parents to buy her a China Doll and is soon haunted at night by a voice that states: "Emily I'm at the stairs"
"Emily I'm on the top step"
"Emily I'm at your door"
"Emily I'm in your room"
"Emily I'm at your bed"
after this occurs the fate of Emily is usually pretty graphic, with her family finding her dead in a closet with her eyes removed and replaced with china eyes - alternate versions have Emily and her entire family murdered by the doll and when police arrive the doll ends with a chilling:
"police, I'm behind you".
these variants of the story share a lot in common with the Man Upstairs, who taunted his victim in a similar manner -there's also a popular urban legend concerning a similar phone-based killer complete with lines such as "I'm coming up the stairs".
China Doll Story (Variant)
a variant of the China Doll story involves a child who obtains a China Doll but is terrified of the thing, becoming convinced it is watching them - the child continually goes to their parents to complain about the doll but are dismissed each time.
Then in the morning the parents enter their child's room and finds teh child dead in the closet with their eyes removed and replaced with those of the china doll's.
This variant of the story is very similar to the methods of the Mystery Killer in "There's A Man At My Window" - another popular ghost story / urban legend involving a child and disbelieving parents.