After the devastating events at Megan’s wedding, Christine brings the Rees family together to make a risky pact. Driven by curiosity and suspicion, Beth follows her husband to a secret meetup. When her investigation into the Rees’ father proves fruitful, Megan and Jamie finally get some answers. The walls are starting to close in on the family, as their spouses, Gethin and Samantha, grow suspicious. How long can the pact last? (thetvdb.com)