In attempting to clear up lose ends from their investigation of a gang of White Supremacists, Major Crimes detectives audit the trial of serial killer Dwight Darnell, and end up facing their most deadly case ever while Rusty's psychologist, Dr. Joe, faces an unexpected confrontation that leaves his life in jeopardy.

Major Crimes hurtles forward towards the mysterious and elusive mastermind in the Dwight Darnell murders while Buzz and Rusty's investigation into the murder of Buzz's father comes to an unexpected end.