A public demonstration of Grayson's technology takes place with catastrophic consequences in the Season 1 finale. Elsewhere, Lucy becomes a member of the undead; Van Helsing does something terrible in the name of revenge; Lady Jane wages war on the vampires of London; and Mina discovers the root of Grayson's obsession with her.
Grayson, who has something he wants to get off his chest about Mina, goes to war with the Order of the Dragon just as Harker becomes a member of the group; Lucy reveals a secret that damages her friendship with Mina, who's still recovering from her attack; Browning desperately searches for his children; and Lady Jane prepares to hunt the ultimate vampire.
Van Helsing has a falling out with Grayson and seeks payback against Mr. Browning and his family; Mina tries to avoid Grayson and focus on her schooling, but ends up being attacked by Lord Davenport's men, an act Harker vows to avenge; Lady Jane learns that Dracula has returned to London.
Grayson feels almost human again now that he's seemingly invulnerable to the daylight; Renfield's employer sends him to Budapest to acquire a mysterious relic; Harker wants revenge for being manipulated into slandering General Shaw, and ends up aiding the Order of the Dragon as they set out to compromise Grayson's demonstration of his technology.
Browning wants the board to meet outdoors in the sunlight in order to prove that Grayson is the vampire terrorizing London; at the same time, Grayson and Van Helsing set out to acquire the final component needed to make their wireless electricity technology a success. Elsewhere, Harker and Mina consummate their relationship, while Lord Davenport plots to destroy Mina.
Grayson and Mina reveal their true feelings while dancing together at a party in celebration of her engagement to Harker. Elsewhere, Van Helsing's first attempt at infusing a vampire test subject with his solar serum takes a disastrous turn; and Renfield is abducted and tortured by agents working for Davenport.
A ruthless Grayson sets out to compromise Lady Jayne by winning her heart; at the same time, his mission of vengeance is complicated by the unexpected arrival of an old friend. Meanwhile, Lucy gets over her heartbreak by throwing her energy into an engagement party for Mina and Harker; and Van Helsing has a breakthrough, followed by a setback.
Grayson investigates whether Lady Jayne is a vampire hunter for the Order of the Dragon; and earns himself a powerful new enemy in the wake of Lord Laurent's death; at the same time, Lucy tries to help Mina get over her broken heart with absinthe, romance and a whirlwind tour of Bohemian London.
Grayson and Lady Jayne become lovers, although he suspects she's involved with the Order of the Dragon. Meanwhile, Mina accepts Grayson's help with a challenge; Van Helsing continues to work on a solar vaccine; and Harker enters into a devil's bargain.
Alexander Grayson marks his arrival in England with a lavish party, during which he becomes infatuated with Mina, a newly engaged woman who strongly resembles his dead former love in the series premiere of this vampire drama.