Halle is a petite young woman described as being of both Western and Eastern descent. It is said the best liar would not be able to say she was more than eighteen at best. As the novel states: she has dark brown eyes and hair suggesting she is Eastern, but her nose and features made it hard to be sure. Halle wears a short denim skirt and white strapped crop top. Her outfit is described as a design without any sense of decoration and it seems her taste lay more along the lines of utility than style. She has an Eastern symbol necklace on her chest which looks equally unremarkable. An appearance bearing the signs of East and West both, and simple, unembellished clothes give her the description of being 'the spirit of the Eastern Quarter made flesh.'
Halle is a young and wild spirit, both ferocious and intimidating when motivated but also having a softer side that enjoys romance movies. She was overcome with a thirst for revenge after learning what had happened to her father, but has now calmed down and is more amicable, continuing to hang around Jack and the seedy bar he plays in. Halle is described as being more cunning and manipulative, as well as calling the shots at the bar.
Despite being a mere fifteen years of age, Halle was nothing short of a genius when it came to gambling. Part of it was due to the incredible amount of effort and dedication she had poured into acquiring her skills, but it was also thanks to her exceptional memory. Her powers of recollection were so great that not even her father nor Jack could compare.
Halle is the daughter of legendary gambler King. When she was a young girl, She was poisoned by Enrique, a crime boss so that he could threaten king to throw a game. King forfeited his life by throwing that game and Halle was brought up thinking he died with an illness until she learned the truth by chance when overhearing some drunk gamblers. The last memory Halle had was of him taking her hand while she was in bed and telling her not to worry.
Halle causes a stir in an Eastern Quarter bar when she pulls a gun on a drunken gambler that was getting too forward. She challenges patron Jack to a game of Poker and then wins. She introduces herself as the daughter of King, the man Jack killed. He invites her to take a shot at his heart with her latest model Orbal Gun. Halle doesn't take the shot, saying it would be meaningless here, inviting him to the Harbor and a ship. She hands him a card with the signature 'Enrique' - a name familiar to Jack.
Many of the underworld had gathered to watch the game, including Chief Minister Shamrock, dubbed the 'Monster of the Underworld' who was the host. in a territorial dispute, Enrique would this time be betting on Halle, with his rival, Won, having Jack instead. At the stroke of midnight, the game commenced.
Halle constantly taunts Jack during the game, trying to throw him off. Jack never spoke to Halle during the games until, Jack began a story about his past with King and how they were paired off against each other, just as Halle seemingly takes an advantage. Jack reveals he never truly won, and King lost in order to protect his family. Enrique tries to intervene and stop the truth getting out, but Won signals his men to stop any interference. Jack pulls four Kings and beats Halle's four Jacks. Jack had apparently cheated and swapped the hands, but that was okay as long as it couldn't be proven. It was the same trick king used to throw his original match. Jack reveals Halle had been poisoned and the antidote would only be given if he lost. King threw away the game to protect his daughter. Halle stand sin shock at the revelation that her father's honour remains intact. Jack claims Halle as his prize, saving her life from shamed Enrique. He saves her as part of his debt to king when Halle asks him why he did this for her. Halle later turns up at the bar and challenges him to a game- on friendlier terms.
Halle features in the Fourth Sun Door, named The Casino -Gambler Jack-, where the player challenges Jack and Halle to a game of Blackjack or Poker. Halle is played first before jack comes out.
Months later after Gambler Jack, Jack and Halle live in relative happiness and they go to a nearby town with a movie theatre. Halle pressure him into watching a romance movie, 'Soliel of Love' but chides jack when he falls asleep during it. They then meet the very same actress from the movie they just watched, the attractive Nike and old acquaintance of Jack's, Leonard, another disciple of King. Halle is stunned by the attractiveness of the woman and thinks hat she will never be able to reach that level of seductiveness. Jack and Halle are invited to go to a race track with Leonard where Jack races against Leonard.
Back at the bar, Halle is the new top dog and due to her more skilled manipulation, essentially calls all the shots. Nike shows up and Halle is surprised to see her, worried about what past she and jack have had. Nike wins against Halle, apparently by cheating but as it can't be proven, it stands. Nike questions Halle about anything her father left her, which turns out to be the pendant. Halle is then kidnapped while taking out the trash, and Jack given a challenge to get her back. Jack travels to one of Calvard's most known race tracks where it turns out Leonard is behind it. Leonard wants the necklace of Halle's that was given to her by her father King. It has huge amounts of data on the criminal underworld that Leonard wants to use to move up the ranks of politics.
To get Halle back, Jack must defeat Leonard in a game of bets on the car races, which Leonard seemingly wins steadily, but Jack takes it at the last moment by placing an extremely unlikely bet and bribing the driver, after sensing the driver wanted an out from the world of underworld betting and a hint from Halle. Jack provided him with an out.
Nike reveals herself as a Rocksmith Agent and arrests Leonard. The prize money is seized and Jack and Halle return to the bar. Jack reveals the code to the pendant drive, which is used by the authorities. Nike one day returns and proposes working as team once again. Jack muses he still can't shake Halle off.