As the squad celebrates the birth of Rollins and Carisi's child, another child goes missing in broad daylight.
Benson (Mariska Hargitay) is taken hostage when she tries to stop a violent home invasion.
MacGyver's Aunt Gwen (Jeri Ryan) gets into his head and convinces Mac and Riley to join Codex.
In tracking down the origin of a deadly strain of tuberculosis threatening Americans, Agent Ryan Booth must go undercover and infiltrate a white supremacist organization.
Mac is placed inside a fake prison cell with a top Codex operative to get intel on their next move.
