Reeling from a tragedy, Christine Rees must be prepared to face a stranger who will enter her life like a devastating storm to destroy everything.

Christine takes desperate measures to prove that Connor's suspicions are false.

Tensions are sky high as Megan’s wedding day has finally arrived. However; on what should be the most joyous occasion; the Rees family find themselves thrust into a shocking series of events.Connor turns up uninvited and armed with some damning information on a USB stick. While Christine is doing her best to keep it together; who can predict what Connor’s next move will be?Beth is still adamant that long-lost father is the key to settling Connor’s claims; but despite her best efforts; Christine continues to shut her down; and an attempt to get information out of Kate proves just as futile.After the recent revelations about Connor; Jamie no longer wants him in their lives. The night goes from bad to worse after Connor tries to confront him and mend the relationship; forcing Christine to step up in order to show just how far she is willing to go to protect her kids – and to make sure no one else finds out about the secrets held by the USB stick.

After the devastating events at Megan’s wedding; Christine takes charge and brings the Rees family together to make a momentous pact that sets them on a risky path. Dedicated as ever to caring for others; Christine pays another visit to her terminally ill mother (Marsha Miller); and helps her client; Kayla; through a c-section. Determined to find answers; Beth follows her husband to a secret meetup. Her investigation into the Rees’ father; Harry; finally proves fruitful; which leads to Megan and Jamie finally getting some answers about Connor. The walls are already starting to close in on the family; as Gethin and Sam start to get suspicious of their partners. How long can the pact last?

An official investigation begins into Connor’s disappearance and DS Pritchard is intent on uncovering the truth. Christine must pull off her most masterful show of lies and deception as she ties up loose ends and sets out to cover the families tracks.Worried that Kate could become a liability if the police come knocking; Christine pays her friend a visit.The pressure is impacting everyone; and the siblings come to blows when Jamie decides to make a rash decision that could destroy The Pact. Once tensions bubble over; the siblings finally have a breakthrough; opening up to each other for the first time since Liam died.Meanwhile Gethin and Samantha grow tired of their partners secrets and lies; leaving Megan and Will to deal with ultimatums and potentially irrevocable damage to their relationships.A damning discovery in the police investigation threatens to expose everything.

In this final episode; the walls are closing in on the Rees’s family and Christine is desperately trying to hold everything together. Will is the prime suspect of the police investigation and Christine is determined to clear his name. With Beth and Joe one step closer to figuring out what happened at the wedding; Megan and Jamie are forced to reveal the truth. Christine continues to spiral as all sense of control is lost and she is forced to reveal a shocking truth to the children. In the midst of everything; Christine has to grapple with the true reality of Kayla’s connection to her family.