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 comes with news. A drunk Gillian shares a dark, sinister secret with Caroline.

A surprise visitor makes Alan's day. Caroline promises to keep Gillian's formidable secret, as long as she steers clear of Robbie. Kate's gesture at Alan and Celia's wedding stuns both Caroline and the crowd.

An unexpected visitor forces Alan to think about his past. Gillian and Caroline are anxious - his decision to keep his secret from Celia is sure to backfire. Meanwhile Caroline and a heavily pregnant Kate set a date for their wedding.