Who Is Veronica Mars?

Veronica Mars is an American television series created by screenwriter Rob Thomas. The series is set in the fictional town of Neptune, California, and stars Kristen Bell as the title character.
http://en.wikipedia.org/wiki/Veronica_Mars

Years after walking away from her past as a teenage private eye, Veronica Mars gets pulled back to her hometown - just in time for her high school reunion - in order to help her old flame Logan Echolls, who's embroiled in a murder mystery.
http://www.imdb.com/title/tt2771372/

Source: IMDB, Wikipedia