
As can be seen in the trailer the movie takes place some ten years after the events in the TV series (which aired from 2004-2007) when Veronica, who is now working as a corporate lawyer, is drawn back to her old haunts (Neptune) and back to her role as a contemporary Nancy Drew.
One thing that is particularly obvious from the trailer is how genuinely happy the original Veronica Mars cast is to resume playing the characters that they obviously love to portray.