Doug Martin (Nick Jonas) is a young adult spending the summer with his parents at their lake house. When rich investment banker Elliot Harper (Dermot Mulroney) moves in next door, Doug finds himself immediately drawn to Elliot's young wife, Lena Harper (Isabel Lucas). Elliot hires Doug to work on his sailboat, and this gives Doug an excuse to interact with Lena, who is often alone due to Elliot traveling for business. Eventually Lena and Doug begin an affair, starting with Doug losing his virginity to Lena. Lena gets them pre-paid cellphones to communicate on, and constantly warns Doug about Elliot's possessive and jealous nature. Lena also shows signs of physical abuse, which she says are from Elliot.