The It Girl 

At the start of the novel, Hannah Jones finds out that the man who murdered her college roommate has died in prison. The book switches chapters from "Before" the murder (ten years ago) and "After" the murder, as we trace the steps of Hannah's first days as a freshman at Oxford, to her present-day life in Edinburgh with her husband Will, as they prepare for the birth of their first child. As the novel unfolds, everything is not as it seems, including the people Hannah counted on as her closest friends. A fairly gripping whodunit, The It Girl by Ruth Ware, is a fun read that doesn't require any heavy lifting on the reader's part.