Can the Undead Unit resist the call of the Siren? Singer/songwriter Briona Solis is one of the top musicians in the world. Her voice is acclaimed as the most radiant on the planet, and she has a gorgeous figure to match. When her band Solace books a two-week tour in Dallas, shows are sold out. Kirsten Wagner is found in a deserted alley just minutes away from the concert. She's in shock and barely alive; her eyes have been removed with surgical precision. The team struggles to gather information on their case, hoping to prevent another assault. And Kirsten isn't the only one. Each night brings a new victim. The Undead Unit must race against time to catch the perpetrator. Will they be able to resist the call of the Siren, or will these cases go unsolved forever?