A flock of vampires show up on the doorstep of the House.  Tranns, deeply afraid of vampires, throws them out, telling them that until it can be proved whether or not they have souls, they can't stay in the House.  Reluctantly, she also dismisses Lylia who invited the vampires in the first place.

 

Unfortunately, Tranns is unable to dispose of Sara, one particular vampire who proceeds to enthrall and bite Shawn.  Chaos ensues and Jesse manages to lock Shawn in the basement cage, out of fear that he may turn.  Sara returns to claim Shawn, but ends up in a fierce battle with Ariadne, ending when Airy decapitates the vampire, reducing her to a pile of dust.  Shawn seems fine afterward.

 

Aden orders Casey to develop a better method for fighting vampires.  After doing careful research of several Watcher diaries, Casey decides to attempt to create a Pushpin Sunburst, a tablet that, when shattered, produces a momentary burst of sunlight, capable of reducing all vampires into dust.

 

Working with Shawn and Jake, Pipira watching on, Casey produces several trials which all explode, the last one nearly killing her.  A stray comment from Pipira throws Casey into a world of dejection, compounding into terror when she realizes that Pipira is a figure from her past.  Jonas and Shawn try to cheer her up, but it is Joey, who confesses that she comes from a family of Watchers, that inspires Casey.  She reworks the formula and manages to produce the first ever Pushpin Sunburst.