Down in the sewers underneath Haven a simple repair job goes horribly wrong when a maintenance worker is attacked and killed. Haven PD is sent out to investigate but what they find is unnerving: the body has been completely drained of blood. Soon, two more bloodless bodies show up: A mailman near a manhole cover and a woman in her shower. Jordan stops by to check on Nathan's health and moments later she and Dwight see a pool of disembodied blood vanish into the sewer.
Dwight, Jordan and Nathan trace the source of the blood back to Mike Gallagher, a troubled member of The Guard who blames Nathan for the Troubles not going away. Mike cut himself and his blood has undertaken the task of fulfilling his subconscious desire to kill Nathan.
When all of them end up trapped inside the police station along with Duke and Jennifer, who has begun hearing Audrey's voice again, Dwight and Jordan are able to hurt the blood but not stop it. It turns out that Duke's "trouble" as a blood sponge is just what they need to survive. It hurts Duke but he is also able to suck up all the blood.
Meanwhile, Dwight sends Dave and Vince to New Hampshire to ID a body that looks like it might be Audrey. They go reluctantly, worried that if Audrey is dead it will spell ruin for Haven. Thankfully, the body is not Audrey and Dave and Vince can hold out hope that the town will be saved.
William makes a bit of headway with Lexie (i.e. Audrey) when he convinces her that all of the customers in her bar aren't real. As soon as Audrey accepts that truth the customers disappear and the "bar" begins to deteriorate around them. Now, they both have to find a way out.
Maybe Jennifer will be able to help since she can hear William counseling Audrey to escape?