While Nick takes on the gut-wrenching task of erasing Antonio's existence in the human world, and Jeremy is sidelined by with a strange poison, Elena and Clay are left alone to deal with the Mutt situation in Bear Valley. Clay and Elena must hurry to find out what toxin is killing Jeremy. Clay is determined to get whatever information he can out of Cain, who is caged in the War Room. Elena heads to town to track down the mysterious woman who stabbed Jeremy in the Mutt's ambush.