Kat and Alfie relocate from Walford to Redwater in a quest to find Kat's long-lost son, Luke, who was given up for adoption to an Irish family 32 years ago.

When her husband, Lee, is murdered, Sarah Manning comes to realize that she knows nothing about his past. Sarah begins to question who Lee actually was and what he did in his work for a powerful global organization. And why did Lee, a salesman, need to carry a gun?

A routine raid led by Emer Berry, a detective in the Irish Criminal Assets Bureau, reveals that a small-time drug dealer has been receiving substantial funding from a seemingly untraceable source – not in cash, but in rough diamonds. When these diamonds are linked to a series of bombings in Belgium, Emer is forced to work with Police Commissioner Christian De Jong.