When an excited first-time father disowns his newborn baby, Alex and Susie suspect the mother, a schoolteacher, has been having an affair with a young schoolboy. At first both parties deny a relationship, but when they run away together, the case is all but proved. Meanwhile, Joss feels sorry for a drunk he and Kelly find in the street and returns him home instead of charging him, overcoming the reluctance of his Russian speaking mother. The next day Joss finds himself in front of Tom - it turns out the drunk was not the elderly woman's son. Alex gets the idea that Jonesy isn't interested in Susie, and makes his own play while they're on a stakeout. Susie allows herself to be swept off her feet and they end up in bed together. But the next day Alex backs off.