"Dancing in the Glory of Monsters: The Collapse of the Congo and the Great War of Africa" Jason Stearns
"Africa's World War: Congo, the Rwandan Genocide, and the Making of a Continental Catastrophe" Gerrard Prunier
Two books on the wars that took place in the DRC following the genocide in Rwanda.
The first is the one to read first, the second is a much-more complex attempt to present all the different factions involved, and all the events that took place between 1994 and 2004.
5 million excess deaths in a series of conflicts driven in large part by Kagame's Rwanda and Museveni's Uganda, with most of the other surrounding nations involved in one way or another.
The violence continues up to the present day, though at a lower level, with Kagame and Rwanda still heavily involved.