In a Dark Dark Wood: Ruth Ware

CREEPY. I hate books like this where the very beginning hints that something horrible happens, because then I can't put it down. Seriously- where did my Sunday go? Leonora- "Nora" is a successful writer who one day out of the blue gets an invite from an old friend from school. She is having a bachelor "hen" party. Nora has completely forgotten about Clare and doesn't want to go, but she doesn't respond right away and feels guilty after seeing how many people send regrets. Her and another friend from school Nina, whom she still sees, decide to go. Once out in the middle of no where at the "glass house" for the party Nina and Nora wish they hadn't come. They have trouble picturing the Clare they knew (as the story progresses you learn Clare was not a nice person) would not have befriended such an odd group. The party gets worse as the first night ends as drugs are brought out and we learn Nora used to date the man, James, that Clare is marrying. Of course games are played about how well everyone knows James and Nora gets sick. It is hinted at that Nora and James had something big happen which caused the break up and we don't learn until later that Clare was responsible for their break up by sending a text "from" James to Nora about what to do with her pregnancy at 15. Nora then never returned to school. The house is broken into on the second night and a man, James, is shot and killed. At first Nora thinks it was some horrible mistake, but then while she is in the hospital too, is told she sent the texts calling James up to the cabin. Clare set the whole murder up because she came clean about the text to Clare as teenagers. She was going to let either Nora or her obsessive friend Flo take the blame, but then Nora sneaks out of the hospital and goes back to the house where the party took place to try to solve the crime. Clare was faking her condition in the hospital and follows Nora up there and poisons her. The cop comes up in time to solve the mystery.