Dark Pact
Matt's most recent case was, on the surface, a simple one. A middle-age father of four skips out on his family to join some kind of New-Age Spiritual Club (read: cult) that offered to eternal peace and tranquility. The wife was understandably distraught, as her husband left in the company of a beautiful, young twenty-something who was saying all the things Victor Pabst wasn't hearing elsewhere.

Matt almost considered it an open-and-shut case until Mrs. Pabst showed him pictures of the symbols that her husband started drawing on the basement walls four months ago. Pentagrams, mostly in animal blood,  adorned the walls of their Queens home. Matt had already decided to take the case on that alone, as the symbols were the kind used to summon demons and other baddies from the Otherside.

But when the wife indicated that Pabst had been using their children's blood to make the symbols, something inside Matt snapped a little bit, and he'd offered her a reduced rate. He hoped that Pabst was really just a guy who was being manipulated by some rogue sorcerer and that he hadn't actually become one; otherwise, this would get ugly in a hurry. He should have gone to Lynch with this, but knowing her, she'd bring the cops into it and if he was dealing with a summoner, this would get a lot of unprepared cops killed.

So he made his way to Los Angeles himself, leaving Whisper in the company of Mrs. Emberstein.

Two days after his arrival, Matt finds himself inside a warehouse not far from the Staples Center, looking at the same symbols from the pictures on these walls. If these people are summoning a demon, he doesn't have a lot of time to find them and stop it.

Just about every summoning ritual he's ever heard of requires a sacrifice, and someone will die if he can't connect the dots.