Jessica Bradley is a holodeck character in the Dixon Hill programme, a glamorous client who hires the detective because she believes someone is trying to kill her.
Jessica Bradley appears in The Big Goodbye. On Picard's first brief visit to the 1941 San Francisco of the Dixon Hill stories, she is waiting in the detective's office and offers him a retainer to find out who wants her dead.
Picard, delighted by the realism of the setting, breaks off to tell his officers about it. When he returns with Data, Beverly Crusher and the historian Whalen, a newspaper reveals that Bradley has since been murdered, and Hill, the last person known to have seen her, is hauled in by the police for questioning.
Her case sets the story in motion before a Jarada probe damages the holodeck and traps the visitors with the gangster Cyrus Redblock.