Dexter finds himself in an odd situation when he has to save a life instead of taking one, and Debra has a scary confrontation with a murder suspect.
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Vincent has withdrawn from the mian community for their safety, and now lives with his memories of his life with Catherine, and mourns her absence, with only his journal for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.
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.
Desperate to start over with Cat, Gabe tries to woo her by taking her on a romantic date.
Cat and Vincent take Agent Knox's offer to extricate and try to lead normal lives -- but forces out of their control conspire to expose them and drag them back into the fray.
Cat's sister Heather drops by for a surprise visit at the worst possible time, just as Gabe suspends Cat and Tess from the squad in an effort to force Vincent out of hiding.
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.
Elliott Burch returns and exposes Catherine to danger and Vincent is again haunted by the life Catherine could have with someone else.
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