The team scrambles to find the group responsible for an assassination attempt on a UN diplomat. Whelan and Reyes find a key clue in the depths of the city’s tunnel system. Stabler struggles to balance the investigation with his mother’s increasing need for support.

Stabler must deal with rapid changes at work and home after returning from a dangerous undercover assignment. Bell hires an advisor whose AI technology program could revolutionize police investigation. Jet and Reyes struggle with Whelan's absence.

Stabler and Officer Bashir track down a missing father and son who could lead to the answers they need. After an undercover operation goes sideways, Bell relegates Reyes to desk duty.

The team works to take down a large-scale drug operation disguised as a local honey farm. In Stabler's absence, Randall searches for Joe Jr. on his own and ends up in a bind.

When the ATF Bureau plans a raid of Redcoat's warehouse, Trisha promises to help Stabler keep Joe Jr. safe. Bell comes face to face with the man who killed Sam. Another Stabler family dinner causes tensions to run high.