The BAFTA-winning comedy-drama about romance and second chances returns as the reunited childhood sweethearts Celia (Anne Reid) and Alan (Derek Jacobi) plan a life together. As secrets from the past come tumbling out and family members adjust to changing relationships, can Alan and Celia find the long-awaited happiness they deserve?
Celia reluctantly introduces Alan to her sister, Muriel. Caroline is stunned to learn that Kate is pregnant and receives a further blow from John when he delivers news. A drunk Gillian shares a sinister secret with Caroline.
Sad news inspires Alan and Celia to have another wedding ceremony attended by all of their family and friends. Caroline whisks Kate off on a romantic weekend, but a disagreement threatens to end the relationship. Just as Gillian and Robbie are back on friendlier terms, a revelation from Judith changes everything.
Gillian is devastated when Celia inadvertently reveals a secret she has kept since she was 15. Alan and Gillian's already fractious relationship suffers as he distances himself further from her. Kate feels awkward around Lawrence, who finds his mum's new relationship difficult to accept.
Alan and Celia's first day as husband and wife is filled with tension. A new arrival surprises everyone, most of all Gillian. Caroline finds a way to buy John out of the house, but will Kate's desire to have a baby threaten their relationship?
As Alan and Celia seize the day, Gillian spirals into a dark place as skeletons surface. Caroline's fractious relationship with John leads her to rethink living arrangements as she makes a bold decision involving Kate.