In "Thursday," a reformed drug dealer from Los Angeles seeks a fresh start in the peaceful suburbs of Texas, where he finds stability as a married architect. However, his past comes back to haunt him when his former accomplice arrives, bringing with him a stash of heroin and a dangerous criminal agenda. This unwelcome reunion draws a host of violent individuals into his life, threatening the tranquility he has worked hard to establish and forcing him to confront the shadows of his former life.