In A Hamptons Summer Affair with My BFF's Brother movie, Olive Parry agrees to be her BFF Sam’s fake girlfriend, and in return, he would pay for her expenses to save her little brother from his evil foster mom. One condition: don't fall in love with Sam’s older brother. Everything was working perfectly until Olive found out that the man she’d secretly pined for after a one-night stand, and Sam’s off-limit older brother were the same person.