A year-end blowout sale becomes literal for a used-car lot after one of its owners is killed when a bomb explodes. While the squad tries to find who is responsible, Rusty dons a bullet-proof vest under the watchful eye of Lt. Chuck Cooper, a Special Investigation Section supervisor, in an attempt to catch the person responsible for threatening his and Sharon's life.

The Major Crimes unit draws closer to finding a dangerous serial killer. Rusty faces his biggest challenge yet when he bravely takes the stand against Phillip Stroh. Complicating the case further, the team goes head to head with Linda Rothman a tough, powerful attorney who doesn't let morals stand in her way of winning a case.