The series depict the adventures of Veronica Mars ( Kristen Bell ) as she deal with life as a college student while moonlighting as a private detective . In this episode , Veronica investigate when two masked men rob a Halloween party and steal Veronica 's necklace from Lilly Kane ( Amanda Seyfried ) . Meanwhile , Keith ( Enrico Colantoni ) help Dean O 'Dell ( Ed Begley , Jr . ) find the biological father of his stepson , the only person who can give the stepson a life @-@ saving bone marrow transplant .