Set 10 yrs after "Rise", most of humanity is gone due to the 'Simian Flu' from the first movie. Still set in/around San Fran, the apes have established a society led by Caesar and have not had any contact w/ humans for several years, making them wonder if there are any left. Well it won't be a spoiler to say that there are and a conflict arises between a survivor colony in the city and the ape colony. Be prepared for a third installment to this series.
As a true fan of the original 'Planet of the Ape' movies, I will say I find these to be a worthy relaunch, especially considering the abortion that was the 2001 film. The acting is decent, the story is engaging w/ character development as well as characters to enjoy, and top notch special effects and cinematography.