Dr Prem Sharma finds himself under pressure to track down and save Dan before it is too late. Facing the threat of an epidemic, Prem has to battle both the ineptitude of the health authorities and the ignorance of locals. When Trefelin's evangelist minister, Herbert Todd, refuses to be vaccinated and openly defies Prem's attempts to contain the virus, the conflict between them threatens to divide the village. While Prem and Todd battle for the hearts and minds of the villagers, Sergeant Emlyn Dawkins has been up all night composing a love letter to the unsuspecting Megan. How will she react when the previously tongue-tied copper puts his innermost thoughts down on paper?