Benson investigates a police officer's accusations of sexual assault; Captain Tucker's retirement party ends in tragedy.
Lindsay's mother Bunny becomes a murder suspect when her boyfriend gets shot; Lindsay must face the review board; high school students are found overdosed on drugs.
When Olinsky catches wind of a grieving father looking to avenge his daughter's death, he goes undercover as a hit man.
After the body of a young woman is found with multiple gunshot wounds, Intelligence identify links to other deaths and realise they are dealing with a serial killer; Lindsay finally meets her biological father.