Harper Clark is a 17 Years old girl with two best friends Yasmin Oren and Matthew Hart , When Harper Finds out about a story about a crazy girl from 1993 who murdered her doctor and ran away into a broke down tower address 13 Dan Street she decided to tell her friends and what they didn't notice is that Yasmins Sister Courtney Oren's birthday party was being celebrated in the broke down tower on dan street address 13 and the story says the girl only comes out on full moons when there is fog but Harper,Yasmin, and Matthew dont know that on Courtney's birthday it will be a foggy full moon