You is a young adult psychological novel written by Caroline Kepnes.
Plot[]
When a beautiful, aspiring writer strides into the East Village bookstore where Joe Goldberg works, he does what anyone would do: he Googles the name on her credit card.
There is only one Guinevere Beck in New York City. She has a public Facebook account and Tweets incessantly, telling Joe everything he needs to know: she is simply Beck to her friends, she went to Brown University, she lives on Bank Street, and she’ll be at a bar in Brooklyn tonight—the perfect place for a “chance” meeting.
As Joe invisibly and obsessively takes control of Beck’s life, he orchestrates a series of events to ensure Beck finds herself in his waiting arms. Moving from stalker to boyfriend, Joe transforms himself into Beck’s perfect man, all while quietly removing the obstacles that stand in their way—even if it means murder.