A young man testifies against his mother for killing his father with secondhand smoke. Inspired by documented cases, “The Pack” weaves together the jury’s cinema verite style deliberation, provocative courtroom testimony, flashbacks, and the family’s intimate home movies. An ambitious Assistant District Attorney (Carlos Leon, “The Big Lebowski”) prosecutes a wife and mother (Arnaz) for murder after her 47-year-old husband dies of lung cancer. Their 24-year-old son decides to testify against her. At first, this appears to be a ridiculous case, but one juror’s doubts and inspiration - a student of hers (Moss) - force the jury into an intriguing, emotional and complicated choice regarding addiction, loyalty, and individual responsibility.