Paige Townsen (Bella Thorne) is a normal college girl working on her business degree who enjoys acting on the side. When a big movie franchise goes into production and opens its doors looking for the next "It" girl to play the lead role, Paige's roommates Cassie (Georgie Flores) and Jake (Charlie DePew) convince her to go to the open casting call. Never in her wildest dreams does she think she will even make it to the callbacks, but after an electric audition with Hollywood heartthrob Rainer Devon (Carter Jenkins), her chance of a lifetime happens. She gets the part, and her life is about to change forever. Meanwhile, intrigue flows through Hollywood as every actor wants a part, in the new Locked film. She must now navigate her new star-studded life and undeniable chemistry with her two co-leads while uncovering the truth about what happened to a missing pop star. Based on the novel by Rebecca Serle.