This could've been so much better if we would've gotten a little background about Claire (Kate Mara) or a reason as to why she'd throw her life away for this particular student. It seemed like Claire is only in it for the sex and maybe to add a little excitement in her life like stealing lipstick from the market. She said she didn't drink all through high school and college and didn't lose her virginity till senior year of college. So if she's always done the right thing her whole life why would she suddenly do something so reckless & irresponsible ? I don't buy it. In my opinion Kate Mara is a dull actress and she comes across as completely robotic as Claire so I find it hard to believe that Eric (Nick Robinson) would become so obsessed with her. Also Claire's friend/coworker is okay with drinking on school grounds and loves the idea of Claire having an affair but when she finds out it's with a student she suddenly gets on her moral high horse & rats her out. I'm not buying that either.