Dog.

Sierra, a teenage sociopath, is consumed by incurable boredom, driving her to experiment with intimacy and violence in search of something that finally makes her feel. Her restlessness only worsens when her naive cousin, Tess, pulls her beyond the safe confines of the suburbs and into a world filled with similarly angsty young adults. Sierra is convinced she can handle whatever the outside world throws at her, but her father isn’t so sure—and neither of them truly knows who’s right.