Madeline is the sharp-tongued secretary of the fictional detective Dixon Hill, a holodeck character who keeps his office running and reminds him of his unpaid bills.
Madeline appears in Manhunt and again in Clues. She sits in the outer office of Dixon Hill's agency in 1940s San Francisco and greets Picard as her employer whenever he runs the programme.
In Manhunt, Picard retreats to the holodeck to avoid Lwaxana Troi, who has decided he would make a suitable husband. Madeline complains that she has not been paid and that the rent is overdue, fends off callers and points him towards Rex's Bar when he asks for somewhere quiet.
In Clues she is seen briefly when Picard introduces Guinan to the Dixon Hill stories, shortly before the ship meets the Paxans. She is one of the few holodeck figures to recur in the series.