Investigating a lethal toxin that was unleashed on a wedding ceremony as a weaponized experiment, Walter uncovers an alarming formula that reveals a link to the Bishop family tree.
Joanna has been keeping for over a hundred years. The shifter threatens Freya. Ingrid suspects Mike's ulterior motives.
Pritchard and Duval must stop a killer who mutilates and disfigures his victims. Meanwhile, as Pritchard and Mary grow increasingly close to one another, Otto feels resentment and wants to find a new donor.
