Henry Marsh is one of Britain's leading brain surgeons. Ten years ago he befriended Igor Kurilets, a fellow neurosurgeon who works in the Ukraine, and ever since he has travelled to the Ukraine twice a year to operate on patients for free. Geoffrey Smith's moving film follows Henry as he travels to Kiev to help Igor operate on a young man called Marian, who without surgery has just months to live. When Henry arrives he faces a serious challenge - Marian must be awake when his tumour is removed, and Henry must use the most basic tools, including a Black and Decker drill.