The sleepy Welsh mining village of Trefelin is in for a shock. When the local doctor dies, his replacement isn't quite what people expect - Prem Sharma is the Indian doctor.

Colliery manager Richard Sharpe is still desperate to find a mysterious green leather diary left behind by Prem's predecessor, Dr Elwyn.

The Indian Doctor's wife, Kamini Sharma, is still desperate to leave the village of Trefelin. But as she tries to escape, she finds herself becoming the only person who can help local tearaway Dan when he gets into trouble.

The new doctor, Prem Sharma, comes up with a cunning plan to diagnose the miners' health problems.