An undercover agent's death leads to the unit's investigation into drug overdoses involving a porn website that specializes in girls who just turned 18. Meanwhile, Rusty finds out that his biological mom is pregnant.
The murder of a detective in the Sex Crimes unit leads Major Crimes into the world of "barely legal" porn, where they find rampant drug use and questionable ethics. Meanwhile, Rusty's biological mother, Sharon Beck returns with some surprising news.—TNT