Till death do they part. Their love has always been extraordinary. But in all 13 episodes of the gripping third season, Detective Catherine "Cat" Chandler and veteran soldier Vincent Keller quickly discover that the price for being together forever may be more than they can bear. A secret and sinister plot to create superhumans is quickly claiming innocents, and even though J.T. and Tess join in the efforts to stop the spread of unnatural powers, it is ultimately up to Cat and Vincent to use their long-desired wedding plans to draw a dark and powerful killer out into the light.