David Oyelowo in HBO Films' "Nightingale"

David Oyelowo in HBO Films’ “Nightingale”

*David Oyelowo is all by his lonesome for the entirety of HBO’s upcoming film “Nightingale,” and a new extended promo shows exactly how the “Selma” star pulled it off, reports TheWrap.

In the completely solo performance, Oyelowo stars as Peter, a war veteran who begins to unravel psychologically ahead of a friend’s impending visit. Peter once committed a heinous act and is suffering from multiple personalities – at least seven.

To prepare for the role Oyelowo stayed in character for the duration of the shoot. The crew never referred to him by David and always called him Peter, as the promo depicts.

To fully immerse himself in the isolated world of his character, even when Peter took a phone call, there was nobody reading lines to him offscreen. The effect has a secondary purpose in allowing the audience to question whether there is actually anyone on the other end of the call.

“Nightingale” is an HBO Films presentation in association with Brad Pitt’s Plan B Entertainment; a BN Films production in association with Sea Smoke Entertainment and Yoruba Saxon Productions.

“Nightingale” will premiere Friday, May 29 at 9 p.m. ET.

Watch the extended promo below: