The Lost Night by Andrea Bartz

Young and stupid, drunk and or high college friends in New York in 2009 live without a care in the world until the night their friend commits suicide. Years later when Lindsay runs into one of the old group questions rise to the surface. Going back over what happened that night with the people involved plus a disturbing video brings Lindsay to a sobering thought - what if Edie didn't commit suicide but was murdered and what if Lindsay was involved? This is the kind of book that makes you cringe when you think of all the dumb things you did in college and came away whole. Tightly written in an intense plot with more questions than answers, you won't come up for air until the crazy twist at the end you never saw coming.