A team of volunteer doctors and nurses are sailing to the poorest nations on earth. This year they will face the most severe of medical issues, not seen in other parts of the world. Huge tumours left to grow unchecked, massive deformities and more. But the medical challenges are only half of the story. They will confront ethical decisions as they decide who will be helped and who will not. This is a searing, complex journey for the volunteer medics, as they deal with life and death cases – and balance the fates of these patients in their hands.