An outbreak of what the Doc suspects is Impetigo leads to problems for Louisa, who must decide whether to follow the Doc's orders to force the infected children to stay at home, or to help the parents by allowing the children to attend school. The decision is made harder by her impending interview to take over the job of Head Teacher - in front of a board of governors that (to his surprise) includes Doc Martin. Meanwhile, an accident in the Fish and Chip shop leaves Bert behind the fryers and the owner's son, Peter, in need of somewhere to stay while his mother is in hospital. His first choice is with none other than a certain Doctor Martin Ellingham...