After an associate of Red's is murdered by a rare medieval device, he alerts the task force that a vigilante group from the Middle Ages known as "The Holy Vhem" has been resurrected and is lethal. Red teams up with Liz and the task force to stop the assassins before any more of the targets are killed. Meanwhile, upon receiving shocking news, Liz carefully considers her next move.

After a missing child that has been presumed dead turns up alive, Red and Liz work with the taskforce to search for a dangerous woman who may be kidnapping children. Meanwhile, Tom faces shocking consequences after his plan to help Liz goes awry.