Ten years after the Simian Flu destroyed life, as the human race knew it on Earth is where the Dawn of the Planet of the Apes picks up. While the human race has struggled to survive, the race of genetically enhanced apes led by Caesar has grown.
The two races live in a sort of peace divided by a river and living out their way of life. As ever peace fails and a war that will decide what race will become the dominant species begins. This is the Dawn of the Planet of the Apes!
Source: Dawn Of Apes