Susanna and Caroline are interviewing people for their film. A girl is found mangled beyond recognition. A man in a cloak comes running through the club.

Davis and Joseph help them investigate at a party in an abandoned chemical warehouse in Oakland. A young man accidentally kills his friend while under the influence of GHB.

Since they have been witnessing acts of violence, apparently caused by GHB; something is wrong with the drug. When Joseph has his own supply tested and there is nothing wrong with it. He buys some from Mira. While using that supply he hits Caroline and she accidentally stabs him with a carving knife. They split up, and a test reveals that the GHB is mixed with Ecstasy, and could cause brain damage. Joseph forces Mira to admit that her boss, Mike Burnhill, is the supplier of the GHB. Joseph tells the others, and they plan to go after Mike Burnhill.

During a party at Susanna and Caroline's loft, Mira's gruesomely murdered body is discovered in the bathtub. Len Kai, a SFPD detective, has stationed men outside the building. When Susanna's film aired on TV, she put out a plea for help finding the killer, and Len has been assigned to the case.

Graham, a guest, did the murders, while using GHB. Joseph is certain Mike Burnhill is behind the making of the tainted GHB. The group go to Burnhill's warehouse the following night. They are followed by Len and his girlfriend. Len he falls and sprains his ankle. Burnhilll discovers the others and chases them up to the roof -- where he stuns Joseph with his gun, but falls off the roof and kills himself. Joseph and Len are taken to the hospital. The end.