David and Annie struggle to accept their painful future, while young couple Millie and Josh desperately try to avoid a similar fate

With pressure mounting, Alina retraces the journey that led her family to Summerwater, where their lives will be changed forever.

The picture-perfect Henderson family try to escape their past at Summerwater, but daughter Becky and son Alex stray into dangerous territories.

Annie's past is laid bare as the Campbells confront their future. Meanwhile, Becky's risky pursuit of Gavin reveals his true colours.

A tragic event at Summerwater reveals the best and worst of human nature, as divides deepen, families pull together, and lives are ripped apart.