<P> Emily is angered by Sean's love for Stephanie, while Stephanie is angered by Sean's eagerness to rejoin Emily . Stephanie agrees to help Emily reappear to the public and frame Sean . Sean is arrested and released on bail . Stephanie has a change of heart and stages a fake argument with Sean in front of Emily to incriminate her, while police - planted microphones are recording . Emily predicts their ruse and has disabled the microphones . Emily confesses to the crimes, and holds the pair at gunpoint, telling them she will kill them and stage a murder - suicide . She shoots Sean in the shoulder and turns the gun on Stephanie--who reveals that she has a hidden camera live - streaming the entire event on her vlog . Emily is arrested . </P> <P> Closing text explains that Emily was sentenced to 20 years in prison, Sean became a successful professor at a major university, Stephanie's vlog has one million followers, and that she has also become a part - time private detective . </P> <Ul> <Li> Anna Kendrick as Stephanie Smothers </Li> <Li> Blake Lively as Emily Nelson aka Hope McLanden / Faith McLanden </Li> <Li> Henry Golding as Sean Townsend </Li> <Li> Andrew Rannells as Darren </Li> <Li> Linda Cardellini as Diana Hyland </Li> <Li> Rupert Friend as Dennis Nylon </Li> <Li> Jean Smart as Margaret McLanden </Li> <Li> Ian Ho as Nicky Townsend </Li> <Li> Joshua Satine as Miles Smothers </Li> <Li> Nicole Peters as Hope (16 Years Old) </Li> <Li> Lauren Peters as Faith (16 Years Old) </Li> <Li> Bashir Salahuddin as Detective Summervile </Li> <Li> Eric Johnson as Davis </Li> <Li> Glenda Braganza as Kerry Glenda </Li> <Li> Kelly McCormack as Stacy </Li> <Li> Aparna Nancherla as Sona </Li> <Li> Dustin Milligan as Chris </Li> <Li> Danielle Bourgon as Grace Smothers </Li> <Li> Gia Sandhu as Valerie </Li> <Li> Paul Jurewicz as Bobby Chelkowsky </Li> <Li> Sarah Baker as Maryanne Chelkowsky </Li> </Ul> <Li> Anna Kendrick as Stephanie Smothers </Li>

Who played the sister in a simple favor