I'm impressed with this collection! Often times collections of short stories tend to fall a bit flat for me, only having one standout amidst an array of otherwise mediocre stories. But I enjoyed almost all of the stories in this collection, only finding one of them to be a dud. 
 The short story format works extremely well for horror stories, as a good horror story should leave the reader thinking on about what might have really happened and reevaluating what they were told and how much of it was true. Since short stories can sometimes end abruptly, this played into the horror aspect, allowing for the reader to be left with intriguing questions that might scare them. Was there actually a killer or did the protagonist do all of the murders herself and hallucinate the killer? Is the one character as messed up as our protagonist or is she an avenging hero? Was there actually a ghost or was this just the protagonist's guilt manifesting itself in a visual form for him? We'll never have the answers to these questions and that makes the stories a bit more scary. 
 Age wise, everyone in this collection is around the YA age, although I would recommend this for older YA readers as some of the subject matter and descriptions might be a bit much if you were as easily scared as I was as a teenager (slash, still am as an adult). If you want some well written short stories this upcoming Halloween season, this collection might scratch that spooky campfire story itch. 
 Favorite stories were: In the Forest Dark (Carrie Ryan), Sleepless (Jay Kristoff) and The Girl Without a Face (Marjorie Lu) 
 The aforementioned dud that I didn't like was The Dark, Scary Parts and All (Danielle Page)