Mark is forced to investigate his fiancee's past when a stranger arrives in the village with a mysterious photo. Mrs Tishell finally removes the neck collar she has worn for years, and suffers a prolapsed disc as a result. Martin reveals his true feelings for Louisa over a few glasses of wine, but he drinks too much and wakes the next morning to a waiting room full of giggling patients, a raging hangover and a distinct feeling of uneasiness.
Make an appointment with the brilliant but socially awkward and neurotic Doc Martin. When Martin develops an aversion to blood, he abandons his career as a celebrated London surgeon and becomes the only doctor in a sleepy small town where his tactless manner soon has the whole town in an uproar.