Andrew Lambert was Siobhan Sadler's lover.
He was part of the team hired to steal the Diadem. When Sadler was completely taken over by the Diadem and left the other mercenaries, Lambert gave chase to try to talk sense to her. He got lost in the tunnels under Peladon and stumbled into a refinery with a neural alarm system. His presence triggered it and it destroyed his mind. (PROSE: Legacy)