 In the ninth series , Harry reinstates Lucas as chief of Section D ; this makes Lucas responsible for the integration of two new team members into the section , Beth Bailey ( Sophia Myles ) and Dimitri Levendis ( Max Brown ) . Vaughn returns and hands Lucas a briefcase with possessions from his life before MI5 , including photographs of him and Maya Lahan . When he visits her , however , she is so shocked at his reappearance and angry over his letting her believe him dead that at first she wants nothing to do with him . Later , Vaughn promises to leave Lucas alone in exchange for an MI5 file on " Albany " ; Lucas eventually hands him what he believes is the file . Believing he is free from Vaughn , Lucas persuades Maya to restart their relationship . However , it is revealed the file was not Albany , though it leads to the location of the actual file . Vaughn forces Lucas to find the file , which is in the possession of former Section D member Malcolm Wynn @-@ Jones ( Hugh Simon ) . After convincing Malcolm to give him the file , Lucas hands it over to Vaughn , but it is soon discovered that this file , too , is a fake , and Malcolm has abandoned the house where he and Lucas had met . To force Lucas to continue seeking the file hand Vaughn kidnaps Maya . By this time , Harry Pierce has discovered that Lucas is not who he claims to be . Arrested and questioned , Lucas admits his true identity and his past , but convinces Harry to save Maya . A mortally wounded Vaughn is able to " wake up " Lucas ' true persona , who he was before MI5 . Believing Harry may not honour the deal they have worked out , Lucas intends to leave the country after getting his hands on the Albany file . The file is revealed to contain directions for building a genetic weapon that Vaughn has agreed to sell to the Chinese . After Lucas acquires the real file from Harry in exchange for team member Ruth Evershed , whom he has kidnapped , Maya is killed while he is trying to escape with her . He delivers the file to the Chinese agents anyway and intends to kill Harry for revenge . During their roof @-@ top confrontation , Lucas learns that Albany is an elaborate deception ; the genetic weapon is unworkable . Lucas then forces Harry to turn around , as if he is about to execute him . Instead , Lucas throws himself from the roof , to his death . 
