Ten years after fleeing the regime in Serbia, Marko finds himself defending some of the very people that he fought against while he lived there, including the notorious Radovan Karadzic.

For Serbian filmmaker Mila Turajlic, a locked door in her mother's apartment in Belgrade provides the gateway to both her remarkable family history and her country's tumultuous political inheritance.

This documentary tells the true-life story of Oggi Tomic, born in Sarajevo but now living in Cambridge. He co-rote and co-directed the film. He was born in 1985 with water on the brain and given only months to live, abandoned by his mother and brought up in a series of Bosnian orphanages during the bitter Yugoslav civil wars. Finally as a teenager he made his way to the UK and a new life. In 2012 he returned to meet his long-lost biological family - and had to grapple with the fact that they are Serbs, and that some of them were among the enemy army that shelled and sniped at during the 1,300 days of the siege of Sarajevo which began 20 years ago.