Alexander Grayson becomes drawn to a woman who looks like his dead former love, while her fiance, Harker, worries about his ability to give her the life she deserves.

A public demonstration of Grayson's technology has terrible consequences; Lucy joins the undead; Van Helsing's revenge against Mr. Browning and Lady Jane leads to a confrontation with Grayson; Mina discovers the secret of Grayson's love.