Setrakian creates a new plan to trap the Master as Eph and Dutch search for the Master's "voice." Also: Palmer fights for his life and needs Setrakian's access to the white and Fet suffers a tough personal loss that reveals a deep family secret.
New information surfaces from the Lumen, forcing Setrakian to seek out lifelong rival Eldritch Palmer for help. Also: Eph's new experiments take him to the brink of sanity and Fet tries to unearth strigoi movements in New York City.
The Master plagues Eph when he offers to return Zack; Dutch rejoins an old group of friends, but wonders if it makes her safer; and Palmer seeks answers for Setrakian's secret strigoi blood treatments.
In the third season premiere, the strigoi become faster and smarter; Eph's son is abducted; Setrakian and Quinlan try to unearth the Lumen's deepest secrets; and Fet helps the Navy seals on a deadly mission through the underground tunnels of New York.