In Deed's court, Jo Mills acts for a mother whose former husband, Paul Robson-Alan, wants their baby to be given the 'MMR' vaccination. Robson-Alan is a British Government health adviser, and the outcome of the case is important to the political credibility of the Health Department. But Paul's ex-wife, Marika, believes the MMR jab is dangerous - and some dramatic new evidence is produced on that.

Meanwhile, Jo's wedding to Marc is still on, but she is so busy that she forgets to turn up for the rehearsal of the service. Jo is angry with Deed when he forces her to attend a legal meeting on the morning of the wedding itself. Will she get to the altar on time, and will she go through with it?