In this trailer for the upcoming final season of the show, Linden and Holder still look appropriately morose, and both the regular rain and the blood rain seem sadder than traditional precipitation. The bathtub seems sad. The kid with the black eye seems sad. It's The Killing. Everyone is very sad. Joan Allen plays the head of a military school where one of the students appears to be involved in a murder; it would seem like a real waste of Joan Allen to have her not be a part of the crime, so consider this your early prediction is that Joan Allen is the murderer. The Killing's six-episode fourth season premieres on Netflix August 1. Prepare to be sad.