Summary:Catherine reaches Vincent in the catacomb and rescues Vincent from his madness. However, as Vincent begins to recover, he realizes he has lost his bond with Catherine and is unable to sense when she is in danger. Meanwhile, a deadly explosion lands Joe in the hospital where Catherine discovers that she is pregnant and debates how to tell Vincent, but as Catherine begins investigating the explosion it leads to her being kidnapped by a powerful crime syndicate led by a shadowy figure.

Summary:Vincent, Joe and Elliot Burch all continue to search for Catherine who is still being held captive as her baby grows inside her. As the delivery comes closer, Vincent begins sensing the childs existence which lures him to the skyscraper where Catherine is being held. However, Vincent may just be too late as the evil Gabriel has plans for Catherines child.

Summary:Following Catherines death on the rooftop, Vincent takes her back to her apartment and leaves her on her bed. Later, as Vincent is grieving, Joe begins an investigation into Catherines murder, hiring a private detective Diana Bennett, who encounters Elliot Burch and also members of the Tunnel World at Catherines funeral. Meanwhile, Vincents past demons re-surface as well as memories of Catherine who soon begins to search for his son.

Summary:Vincent has begun his quest to find his son and makes his first move by revealing himself to Elliot. Meanwhile, Diana has become immersed into Catherines life and soon discovers the entrance into the Tunnel World in the basement of Catherines apartment building and Elliot discovers the role Moreno played in Catherines death which leads to a confrontation resulting in Vincent being shot.

Summary:Recovering from gunshot wounds, Vincent begins to have nightmares about a bad snowstorm reaching the tunnels. Meanwhile, Gabriel hires an assassin named Snow to find and kill Vincent. With Moreno dead, Joe has taken over as district attorney and asks Diana to continue her investigation into Catherines death. Unknown to anyone, Snow enters the tunnels and Diana also gains entry and begins her search for some answers.

Summary:Not wanting to put the Tunnel World in further danger, Vincent decides to leave the tunnels and with the death of Snow, Gabriel plots for Vincents demise. Meanwhile, Elliot is on the verge of financial ruin and Gabriel promises him he will restore his empire if Elliot were to betray Vincent. Diana reveals what she has found to Joe and later she stakes out Catherines grave where she encounters Vincent who is in critical condition following an explosion on the docks that may have cost Elliot his life.

Summary:In the aftermath of the boat explosion that most likely killed Elliot, Diana is shocked when she encounters a wounded Vincent who collapses on Catherines grave. She takes him back to her apartment where she nurses him back to health and they soon connect, with Vincent telling her about Gabriel. Meanwhile, Father comes above fearing Vincent has died in the explosion and seeks information from Joe.

Summary:After Vincent entrusts Snows ring to Diana, she quickly discovers Gabriels henchman have targeted her and soon kidnap her and take her to Gabriel. Meanwhile, Vincents son has fallen ill and Gabriel convinces Diana to have Vincent surrender to him. Feeling that his son is slowly dying, Vincent surrenders and Gabriel quickly has him locked in a cage but allows him to meet his son for the first time.

Summary:With Vincent caged, Gabriel allows him to see his infant son who suddenly begins to make a miraculous recovery. Meanwhile, Diana is pursued once again by Gabriels henchman but she manages to contact Joe with a lead that ultimately leads them to Gabriels home in Staten Island. However, they may just be too late, as Gabriel has decided to kill the baby.

Summary:Rolley is shot while trying to rob a liquor store and takes refuge in the tunnels. This brings his heroin addiction to the forefront and Vincent vows to do his best to help Rolley which leads to a fiery encounter at a drug house that unknown to Vincent is run by Gabriel. Diana offers Vincent a hand in his quest to find his son while Joe orders Diana to tell him all the information she knows about Vincent.

Summary:In the aftermath of Gabriels death, Vincent introduces Diana to the tunnel world where she attends a naming ceremony for Vincents son, whom he names Jacob after Father. At the ceremony, Father receives a visit from Jessica, an old flame from his past and they rekindle old feelings for each other which makes Father consider staying above permanently. Meanwhile, Diana begins investigating the bizarre murders of ex-tunnel dwellers.

Summary:After he learns that ex-tunnel dwellers have been murdered, Father returns to the tunnels only to have a run in with Gregory who is seeking revenge for his fathers death who died in a cave-in 20 years prior. Meanwhile, Diana investigates the murders and seeks to catch Gregory before he can kill again.