When a third Helper is killed, Vincent and Diana find a common thread and believe this is the end.
Vincent has held his son throughout the night, just the two of them, but Gabriel will not let this continue, and returns, demanding to have his son back.
Diana takes the ring to a jeweler to find out information on it, but through it she is connected to Vincent. Gabriel tells her that Vincent's son is dying and without his father the baby will die.
Vincent has withdrawn from the mian community for their safety, and now lives with his memories of his life with Catherine, and mourns her absence, with only his journal for company.
Diana takes Vincent to her home, and cares for him as best as she can. For three days he hovers between unconsciousness and delirium.
The man who killed Catherine and took her baby sends an assassin to get Vincent. He manages to find the underground world and goes looking for him. Vincent upon learning of his presence tries to lead him away from the others.
Vincent has begun his quest to find his son and makes his first move by revealing himself to Elliot.
Vincent carries Catherine back to her apartment. He stays with her until his enemy, the dawn, forces him to leave.
Catherine walks fearlessly into the dark cave, where Vincent is roaring in rage and fear, apparently in control of the 'Other' side of himself.
After saving Vincent from the edge of death, Catherine becomes involved in an investigation to expose a vast criminal empire, but is kidnapped with a secret that will change her life forever.
Cat and Vincent are forced to revisit a romantic destination from their past, which enables them to come to a new realization about what they mean to one another.
When some of Gabe's acquaintances go missing, Cat and Vincent must come together to save them.
Vincent goes on a national talk show to reveal he is still alive, while Cat dives into an undercover case for FBI Agent Dana Landon.
Vincent's decline accelerates, and everyone in the tunnels fears for his sanity. Only Catherine can calm him.
Though the lies of an evil man, the campaign to destroy Vincent's humanity continues, until he is forced to kill an unharmed innocent man.
Someone who knows a great deal about Vincent and Catherine gives a reporter information and their lives are thrown in turmoil.
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