The description says it upfront on the cover.
"Ten Teens. Three days. One killer."
So that's a simple enough premise but it is hard to live up to since there have been so many teen killer/slasher tropes/movies/books around that this book will REALLY have to work very hard to overcome all the stereotypes. Or come up with an incredibly original twist/plot line.
Unfortunately it brought nothing new to the table. The writing flows but it felt almost cinematic, as if Ms McNeil was angling for a book-turn-movie deal instead.
The plot bounces along but I just feel nothing for the characters at all. Cynical heartless monster reader that I am. :-)