The entire squad races against the clock to solve the puzzles and uncover the clues scattered throughout the city by a serial killer who is taunting them to find him and the next victims on his list.

Complications ensue in the investigation of a Stone Cold Assassins gangbanger who fell off a building after the victim that he tried to rape bit him in self-defense when the vic's twin sister cops to the crime, seemingly impossible due to the evidence until the secrets regarding the sister's true genetic identity are revealed.

Teenage boy Eric Byers admits himself into the squad room, and warns the team about an unnatural desire towards his younger stepbrother, Cory Kelly. Detective Elliot Stabler and Olivia Benson’s suspicions arise, and Eric admits to also looking at a website to try to curb his pedophilic urge. With no crime committed, the detectives decide to investigate this “self-help” website for pedophiles leading them to it’s creator, Jake Berlin. Eric’s rage induced stepfather is also questioned, and shortly after Eric is found missing. The detectives must race to place the clues together to find and stop Eric before any crime is committed.

A grandmother reports that her 2 year old granddaughter has disappeared, but the Amber Alert fails to yield progress. The detectives then move their attention over to her young irresponsible mother as their prime suspect.