It's Merton and Jenny's big day, although the event doesn't go according to plan when a former CID colleague of Merton's asks the team to track down an ageing bank robber known as "Ronnie the dog man". Things begin to go wrong when Jenny's disgraced brother Steve returns, claiming to be a changed man and desperate to make amends. Meanwhile, Vernon promises Jenny that he will catch a fresh wild salmon for the wedding, only for Bernie to be more successful than him, whilst Bellamy turns to Blaketon when Gina becomes paranoid that he only wants to marry her because she is pregnant.