Charles and Isabella marry to secure funding for the viaduct. In an effort to keep prices fair, Coates takes over the market but makes himself enemies. An outbreak of fever causes panic in the Quaintain household.

Convinced that Red had something to do with the explosion, railway detective Bamford offers a reward for information. Desperate to help George forget recent events, Annie asks Johnny to look for new lodgings, but his replacement makes matters worse.

Recently widowed Annie Quaintain sells her home and possessions to pay off her late husband's debts. Looking for work and a place to stay, Annie and her two children set off for Culverdale Valley, where an enormous viaduct is being built.

With Johnny in the frame for Red's murder and Jericho's workers calling for justice, Annie pleads with Charles for help. George starts to buckle under the pressure of his dark secret, and it's up to Coates to deal with the situation.