Veronica Mars (tv-series, 2004)

The series is set in the fictional town of Neptune, California, and stars Kristen Bell as the title character, a student who progresses from high school to college while moonlighting as a private investigator under the tutelage of her detective father. In each episode, Veronica solves a different stand-alone case while working to solve a more complex mystery. The first two seasons of the series each had a season-long mystery arc, introduced in the first episode of the season and solved in the season finale. The third season took a different format, focusing on smaller mystery arcs that would last the course of several episodes.