Lana's daughter Emma returns from London and announces that she's getting married next month. Things become more complicated when Lana learns that the man who stole Emma's heart is the son of the man who broke hers years ago.

Surviving victims of Michael Myers form a vigilante mob and vow to end his reign of terror.

Uptight and straight-laced, FBI Special Agent Sarah Ashburn is a methodical investigator with a reputation for excellence--and hyper-arrogance. Shannon Mullins, one of Boston P.D.'s "finest," is foul-mouthed and has a very short fuse, and uses her gut instinct and street smarts to catch the most elusive criminals. Neither has ever had a partner, or a friend for that matter. When these two wildly incompatible law officers join forces to bring down a ruthless drug lord, they become the last thing anyone expected: Buddies.