Following Catherine and Vincent's marriage, they are on their honeymoon in Paris. Someone spoils their honeymoon by attempting to expose beasts, which leads to a bounty hunter wanting to kill Vincent.

As Cat and Vincent hunt for a black market buyer searching for beasts, they have to protect an heiress whose identity was exposed. Cat and Vincent realize how much they have to lose if Vincent's true identity is revealed.

While attempting to be normal newlyweds, Cat and Vincent grapple with how to overcome the danger lurking. They find themselves in the fight of their lives when their happiness becomes jeopardized.

While working to uncover who is after Vincent, Catherine thinks she might be pregnant. A lead Vincent follows puts his life in jeopardy. Meanwhile, J.T. gets kidnapped in a case of mistaken identity.

As the friends are under heavy attack by yet another hired gunman. Vincent's fever from the wound makes him experience the life where he is not together with Catherine, saying this would be best for her, which turns out to be complicated.

Cat and Vincent are forced on opposite sides of the law, which puts their relationship in jeopardy.

Vincent and Cat fight to reclaim some normalcy to their lives, even as the threats of a beast bounty and a DHS manhunt loom. Meanwhile, Tess takes a huge risk by protecting Vincent from nosy reporter Grace Rose.

Vincent and Cat wonder if it's time for life on the run after discovering they have lost control of their secret; Vincent sees that he must face his past, while Cat worries about how much they have to lose.

Vincent and Cat are willing to make the ultimate sacrifice to stop an attack and rid the world of beast makers once and for all.