Ten really reminded me of the Christopher Pike I obsessively read when I was 13. (For the record, my favorite was Die Softly--that was super creepy and now I kind of want to re-read it.) This is a retelling of Agatha Christie's And Then There Were None, which is a really messed up story (and very much worth reading if you like horror/scary books) and Ten isn't as disturbed as the source material (particularly the ending); Ten also isn't faithful to the nursery rhyme like the original, though it does follow a pattern that's revealed later in the novel. 
 Honestly, there's not a lot of realism in Ten, but there's something fun about it regardless. The drama is totally amped up, the kids are kind of dumb (it's pretty easy to figure out what's happening, despite some pretty decent red herrings) and there are loads of lines I hope are intentionally drawn from teen slasher flicks. 
 (view spoiler)[My biggest annoyance is with the romance subplot, in which the main character tells her crush she loves him at the end of the book. I get that being stalked by a crazed killed heightens emotions, but that's way too soon, since they'd only kissed twice. (hide spoiler)] 
 Anyway, Ten is definitely creepy if you're in the mood for an old school teen slasher novel. Three stars is probably a bit generous, but it creeped me out, so it's one I'd recommend to someone looking for a scary read. 
 My book club's subversive pick for Oct.