Shawn, Juliet and Gus arrive at the house. They break in and find Lassiter there with Marlowe. They are shocked to see this, but Lassiter quickly tells them that she is innocent. Upon further investigation of the apartment, they learn that Marlowe has three male roommates — one of which is named LUCIEN. They question Lucien. It turns out he's clean. He explains that he was working at a mini golf place at the time of the murder. Shawn SV's a few things from the apartment... a cat litter box, a cracked mirror and an address. Lucien tells them that those things are all in his roommate ED'S room. They have the wrong roommate! With that, they head straight to the address Shawn SV'd. They arrive and see that they are at a blood bank.

At the blood bank, Shawn, Gus, and Juliet witness a series of strange occurrences that only further support Shawn's vampire theory. Then they see a cloaked figure break into the blood bank and flee the scene. They are unable to capture the suspect, but Shawn recognizes a jewel encrusted nail in the debris of the break-in and immediately makes the connection that Marlowe had the same exact fingernails. She must have been behind the break-in! They must get to Lassiter before she sucks him dry!

They arrive at Lassiter's apartment, and sure enough, Marlowe is there with him. Shawn presents the fingernail evidence, and Lassiter has no choice but to arrest her.

Later, at Marlowe's house, they find even more damning evidence against her: bags of blood she has stored and hidden. However, Marlowe's name is cleared from the murder when they get a call that another body has been drained of blood, but hasn't been declared dead yet. There's no way she could have done it because she was in police custody.

They head to the hospital where Shawn makes the connection that all the victims have the same blood type — O negative, an extremely rare type — and that only about a dozen people in Santa Barbara have it. Shawn discovers a name on the O negative blood list that tells him that ADRIAN VICCELLIO has the same last name as Marlowe, and that they must be brother and sister. Juliet then realizes a frightening piece of information... Lassiter has O negative blood type and therefore Adrian must be coming for his blood next.

Marlowe tries to warn Lassiter over the phone, but it's too late. Adrian lunges at Lassiter and covers his mouth with a rag drenched in chloroform. As Adrian sets up the equipment to drain Lassiter's blood, Lassiter comes to and Adrian tells him that he was a mark at the bar — that Marlowe was supposed to drug and drain him of his blood, but she didn't because she liked him. He manages to take down Adrian by himself just as Shawn, Juliet and Gus show up to save him. Lassiter tells the group that he was able to take down Adrian because he has been building up a resistance to chloroform for the last 15 years. And with that, Adrian is taken into custody.

Later, Lassiter finds himself completely distraught about Marlowe being in jail. He visits her and tells her that despite her criminal activity, he knows that she was just trying to help her brother, and tells her that he will wait for her until she gets out.

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