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Mabel Watson is first seen when she and Lord Manton's valet, Kenneth Barnes, help load suitcases of their employers for the train journey to Southampton.
On board the ship, Barnes asks if they are in the Maid's and Valet's Saloon. Stewardess Desmond orders everyone to take their seats for dinner. Watson asks if they, being servants from English and Scottish families, can sit together, which Annie allowes.
Watson starts to read, but Barnes snatches her book away and throws it to other servants, who all prevent her from getting her book back. Watson pleases a servant to give it back, but he starts to read out loud. Barnes tries to stop it, but one servant rips a page half off. Annie puts a halt to it, and Barnes gives back the book. Mabel is devastated by the damage, as the book was a Christmas gift from her father in 1891 and it was undamaged until that night.
Later, they make up the bed for the Mantons. Barnes tries to apologize to Watson again.
That Sunday night, Watson gets to know about an iceberg collision. She heads over to the Manton's cabin and helps Lady Manton get dressed. When Louisa notices a brooch among her jewelry which she wasn't wearing last night, Watson seems shocked. It later transpires that Label's father is now too sick to work, so she stole the brooch to sell. She tried to frame 3rd class passenger Peter Lubov by taking Lady Manton's jewellery box to him to fix (even though it wasn't actually broken) but Barnes catches her, and tries to help her sneak the brooch back to Lady Manton.
Once reunited with Georgiana, the group heads out to Second Class to avoid the masses in First Class. They pass the Purser's Office, where loads of passengers ask for their jewelry. Lady Manton is relieved she kept her jewels with her. Suddenly the Batleys, who found their way up to First Class, find the Mantons, and Muriel heap abuses on Lady Manton about her 'aristocratic' behavior. Lord Manton tries to make her shut up, but his efforts are in vain and John Batley has to push her wife away.
Watson follows her boss everywhere she goes, and when they find one of the collapsibles, Lady Manton makes a shocking revelation: he knew about Hugh's secret all along and she refuses to board the lifeboat. Georgiana suggests they all stay together, but her boyfriend Harry Widener literally drags her into the lifeboat and then steps back. Hugh desperately wants her to survive, and Louisa has yet to decide when the boat is on the verge of being lowered and the episode ends in a cliffhanger.