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.
Mac is placed inside a fake prison cell with a top Codex operative to get intel on their next move.
After Oversight is almost killed in a bombing, he recruits Mac to help him find the suspected bomber, Mason (Peter Weller).
