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.

Grayson investigates whether Lady Jayne is a vampire hunter; Lucy employs absinthe, romance and a tour of London to mend Nina's broken heart; Grayson earns a powerful enemy.

Grayson tries to win Lady Jayne's heart; Lucy hides her broken heart behind planning Mina and Harker's engagement party; Grayson's reunion with an old friend complicates matters; Van Helsing suffers a setback.

Harker learns Gen. Shaw isn't the hero he pretends to be; Van Helsing's first test with the solar serum is a failure; Davenport's people abduct Renfield; when Grayson dances with Mina at her engagement party, their feelings are revealed.

Browning hosts a board meeting in the sunlight in an effort to expose Grayson; Grayson and Van Helsing acquire a vital component for the wireless electricity technology; Mina and Harker advance their relationship.

Grayson is intoxicated by his invulnerability to sunlight; Renfield is sent to Budapest; Harker realizes he was manipulated.

The cancellation of Grayson and Van Helsing's demonstration leads Van Helsing to seek revenge; Harker forbids Mina from seeing Grayson; Lord Davenport's men attack Mina; Lady Jane learns Dracula is in London.

While Mina recovers, Harker decides to join the Order of the Dragon; Browning searches for his children; Lady Jane gets ready for the ultimate vampire hunt.

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.