Darkness is growing within Lavinia and if she can't learn to control it, more than just her humanity will be lost. After receiving a cryptic message from the Sea Witch, Lavinia and Jameson must find the Obsidian Caves if they want a chance at stopping Prime. As more hunters arrive at their compound, they learn he's closer to victory than previously believed. Answers won't come easy for any of them, but an infuriating vampire will be the key to bringing...