In mid-2011, Rossum starred in D. J. Caruso's social film, "Inside"; the online film aired in several segments, incorporating multiple social media platforms including Facebook, YouTube, and Twitter. The following year, Rossum played Ridley, a siren Caster in "Beautiful Creatures" (2013), based on the young adult fantasy novel of the same name. Although the film was released to mixed reviews, Rossum's performance was praised by critics and fans. She also starred in the drama "You're Not You" as Bec, an inexperienced caregiver who looks after and befriends Kate (Hilary Swank), who suffers from the degenerative disease ALS. By June 2013, Rossum was cast as the female lead opposite Justin Long in the independent romantic comedy "Comet", which was directed by Sam Esmail, to whom she later became engaged. Afterward she appeared in the film "Before I Disappear" (2014), based on the Academy Award-winning short film "Curfew".