Doc Martin · S4, E3
Perish Together as Fools
PC Penhale is delighted when his beloved older brother Sam comes to visit. When Sam offers to re-paint the surgery, Martin observes him and concludes that he may have a rare genetic disease, but a blood test discloses something unexpected which could alter the brothers' bond forever. Meanwhile, Al acts on some relationship advice from Bert, but things go from bad to worse with Pauline.
