HBO has added Helena Bonham Carter and Rebecca Hall to the Steve McQueen-produced drama “Codes of Conduct.”

“Codes of Conduct” revolves around Beverly Snow, a young African-American man, played by newcomer Devon Terrell, who enters New York high society, but has a past that may not be what it seems.

Bonham Carter plays a divorced mother of two grown boys now living life on her own terms – terms that change dramatically after she crosses paths with the enigmatic Snow.

Hall will play the eldest child of a New York billionaire who emerges as Snow’s foremost rival, and his equal in guile and ruthlessness.

Paul Dano is also part of the cast.

HBO recently gave a pilot order to the drama that McQueen and Matthew Michael Carnahan are co-writing. The two are also exec producing with Iain Canning, Emile Sherman and Russell Simmons. McQueen will direct the pilot.

Bonham Carter, who is repped by WME, the Schiff Company and Conway van Gelder Grant, can be seen next in Disney’s “Cinderella,” where she plays the title character’s Fairy Godmother. She also has the period pic “Suffragette” bowing next year as well.

Hall, who is repped by WME and Julian Belfrage Associates, can be seen next in “Tumbledown.”