Titanic: Blood and Steel - Season 1 - Eps 5: Under Lock and Key
Mark's story is fully revealed. When he lived in Belfast, he had a girlfriend, Siobhan Doyle. She was supposed to follow him but never did. Siobhan died soon after. His father told him she had died of TB. Instead, she had died at childbirth without him ever knowing. Mark realises how much Siobhan suffered, and is heartbroken. She was sent to a convent. To his utter shock, he finds out that the child survived: a baby girl. He tries to find her, but the nuns will not tell him anything. An accident occurs that forces him back to work: RMS Olympic, a ship in the same class as Titanic, has had a serious accident. Mark is asked to study the implications. Mark's new discoveries are now less important that delivering on schedule. Pirrie and Andrews discover that Mark Muir is a Catholic, but guard his secret.
About Titanic: Blood and Steel

Title: Titanic: Blood and Steel
First Air Date: 2012-05-13
Last Air Date: 2012-08-15
Status: Ended
Rating: 7/10 (from 26 votes)
Language: EN
Seasons: 1
Total Episodes: 12
Network: History TNT Serie
Genres: Drama
Production Companies: Tandem Communications, 3 Arts Entertainment, Artists Studio, CBC, DAP Italy, De Angelis Group, Epos Films, Atresmedia, RAI
Synopsis
Belfast, 1909. The Harland and Wolff shipyard has been handed the greatest project in its history. It will build a great, unsinkable ship. And it will be called the RMS Titanic.
Cast

Kevin Zegers
Mark Muir

Derek Jacobi
Lord Pirrie

Alessandra Mastronardi
Sofia Silvestri

Valentina Corti
Violetta Silvestri

Massimo Ghini
Pietro Silvestri

Ian McElhinney
Sir Henry Carlton

Billy Carter
Thomas Andrews