The series follows the lives of the people who made the Titanic: from the workers who built it to the rich financiers. Dr. Mark Muir, an engineer and metallurgist, convinces American tycoon J.P. Morgan to hire him for the biggest shipping project in the world, the construction of the RMS Titanic at Belfast's Harland and Wolff shipyard. Mark is in truth a native of Belfast born Marcus Malone. Now with a new name and identity, he tries to hide his heritage from his employers, as he is Catholic and his employers, the Protestant elite that rule Belfast, dislike Catholics. While working there, Mark falls in love with Sofia Silvestri, an Italian immigrant. However, during the construction of the Titanic, tensions rise between the lower-class workers and the rich elite. More setbacks stall the construction: Harland and Wolff want to save costs and use cheaper materials, the workers wish to form a Trade union, the women suffrage movement in the UK and the battle between pro Home Rule and pro-Unionist groups. Mark attempts to deal with it while trying to escape his past.