Beca, a freshman at Barden University, is cajoled into joining The Bellas, her school's all-girls singing group. Injecting some much needed energy into their repertoire, The Bellas take on their male rivals in a campus competition.
A seedy bar owner hires a mysterious Croatian to commit murder, but a planned double-crossing backfires when a young waitress is taken hostage. A suspenseful, yet darkly humorous chain of events builds to a bloodcurdling climax.
When a teenager is placed under house arrest, he succumbs to despair and starts spying on his neighbors, hoping to spice up his life. This, however, leads him to witness a serial killer on the loose.