Jennifer Lopez plays a divorced young woman who has a romantic relationship with her next-door neighbor, a young student named Noah (played by Ryan Guzman, the actor of Step Up). Her life takes a sharp turn for the worse... JLo plays a teacher whose husband is a philanderer. Shortly after the divorce, a handsome young man named Noah moves in next door. He has a good relationship with his son. He goes to her class and he says she is beautiful. So they get closer and closer. After a night of love, JLo wants to break up the affair, but Noah becomes a dangerous, perverted stalker who wants to ruin her life, her job, and everything she has.