Misha Brankov is a retired music professor. One morning he receives a letter asking him to contact the Jewish Museum in Belgrade. There, he learns that during excavations on the city sewers, an iron box was found on the site of an infamous World War ii concentration camp for Serbian Jews. Inside the box is an unfinished musical score called When Day Breaks, composed by camp inmate Isaac Weiss. Prompted by this discovery, Misha starts searching for the truth about himself and his origins, and he uncovers the little-known truth about the Judenlager Semlin camp, one of the worst Nazi execution sites, in the heart of contemporary Belgrade. He becomes obsessed with the idea of completing the unfinished composition, and performing it on the site of the former camp. Pursuing this obsession will change not only his own life, but also the lives of all those around him.