fun becomes terrible

all of her friends came, scared.  they went in as they heard something like laghing and running up and down steps.  stacy sent two kids up. they saw a bloody room. 1 ran down, the other screamed and vanished as lightning struck the side of the house.  7 others died along with the lightning. stacy and 1 other kid ran outside.  stacy fainted. the doors swung open as a ghost killed the other kid.  stacy was the ghost who planned the deaths. she was the murderer