When an unusual tattoo leads back to Roman, the team must decide whether to send him into the field…to go undercover with a dangerous biker gang.

Weller and his former FBI partner reunite for a dangerous undercover mission while Zapata interrogates a past foe.

After a disturbed Iraq War vet shoots up a military base, the team exposes a sinister plot. As Jane and Weller race to stop a single-minded scientist, Jane recalls her…