That night on board the Titanic, Lubov has a conversation with Mary's husband Jim Maloney. Lubov and Mary constantly exchange brief looks at each other, which Jim doesn't appear to notice. Mary suddenly drops her cork, which rolls to Peter. He brings it back to her, making her nervous. She reluctantly thanks him, without looking at him anymore.
That Sunday, Second Officer Lightoller allows Lubov to attend a church meeting with passengers of all classes, including Lord and Lady Manton, John and Muriel Batley, and Mary Maloney. Lubov takes a seat next to Mary, but he tries a bit too hard to approach her, causing her to move over to another seat.
When the ship is sinking, steward Turnbull refuses to allow the Maloney family to go to the lifeboats. Lubov grabs Turnbull and Mary rushes through the gate with her four children, but two other stewards close and lock the gate again, trapping Lubov in steerage with Jim Maloney.
The episode opens with Winston Churchill inspecting the bodies of two murdered policemen, killed by the gang of Peter Pietkov, aka Peter the Painter or Policemen killer. Churchill desperately wants Pietkov found.
Meanwhile, in a basement, Lubov seems to be hiding from the police patrolling the streets.
He presents his ticket to Fourth Officer Boxhall at the second class gangway, but he is redirected to the steerage gangway.
That evening, Lubov is having a conversation with Jim Maloney, but Lubov and Mary Maloney constantly exchange brief looks at each other, which Jim doesn't appear to notice. Mary suddenly drops her cork, which rolls to Lubov. He brings it back to her, making her nervous. She reluctantly thanks him, without looking at him anymore. Jim noticed the weird behaviour of her wife.
Later, Lubov is reading a book, but another passenger keeps looking at him, smiling. Eventually, the passenger tries to make a conversation, but Lubov avoids him. The passenger moves to Lubov's table and introduces himself as David Evans, a retired army man. When Evans says Lubov looks familiar to him, Lubov angrily says he is not.
That Sunday, Lubov attends a church meeting in steerage with the entire Maloney family. Lubov then says to Jim he is going to get another "dose of religion", an Anglican church meeting in first class. When he arrives, Mary Maloney is already there and Lubov takes a seat next to her. When he tells her not to be afraid of her feelings, she moves to another seat.
When Lubov goes for a walk on deck, he finds Mary Maloney again. She finally confesses to him and he drags her into a kiss. Suddenly Mary's husband Jim intterupts them and starts to beat up Lubov. Mary holds him back and Lubov just walks off.
When the ship is sinking, Lubov stands in a corner while stewards keep them down in steerage. Finally, steward Hart takes a group of women and children through the gate, but steward Turnbull quickly cuts off the line. Jim Maloney wants to get his wife and children through, but Turnbull is getting bossy. When Lubov intermingles, he grabs Turnbull and Mary escapes with her children. The other two stewards close the gate again, leaving Jim Maloney and Lubov still trapped down below. David Evans then lures Lubov far away from eye witnesses by saying he found another way up. He presses Lubov to the wall and says he's Peter Pietkov, Peter the Painter, Peter the Policekiller. Lubov snaps Evans' neck and returns to the gate.
Fireman Mario Sandrini appears on the other side of the gate and points to the women and children still trapped down. Lubov offers Jim Maloney to go up together and se the rest of the Maloney family in a lifeboat, then they can fight their issue about Mary. Turnbull opens the gate and Lubov escapes with Jim.
The story of Lubov picks up where it stopped in Episode 3. He follows Jim to A Deck, where lifeboat 15 is being loaded. Mary and the kids try to board the lifeboat, but she's trampled. A stranger tries to assist her, only to be stopped by a jealous Jim. Mary calms his husband down and they all approach Murdoch to the boat. Hugh manages to override Murdoch's command to stop loading the boat and Mary enters with the children. Murdoch orders steward Hart to get in the boat and take charge.
Suddenly, Theresa panicks and bolts back on the Titanic. Jim abandons Mary to go find her. Lubov realizes he has to help him and will not survive himself. He goes to the lifeboat, says "remember me" to Mary and goes to look for Theresa.
He stumbles into Jim very soon. Lubov manages to put the issue about Mary aside and suggests to split up to look for Theresa.
Lubov soon wanders through a flooding corridor, shouting Theresa's name. Paolo Sandrini hears it and summons Lubov to help him free his trapped brother and the Gatti's waiters. Lubov, with his locksmith skills, manages to open the door of the cupboard just in time for Mario to escape and survive. Lubov stays behind in the flooding corridor, having done his final good deed by helping Mario survive the sinking.
Eventually Theresa will be found, only to die together with her father.