Lieutenant Hermes Papauran, one of the best investigators in the Philippines, is at a deep moral crossroads. He is a first-hand witness of the murderous anti-drug campaign conducted by his force, his anxiety and guilt triggering a severe skin disease. As he tries to heal, a dark past haunts him.

本片深入研究了人性——也许是我们动物性冲动的进化。雨果岛是菲律宾群岛中一个被上帝遗弃的岛屿，在这里只有很少的好事发生：日本占领者在二战中建立了一个强迫妓女的营地，现在矿工们为了微薄的收入在泥泞中拼搏。其中三个人于是开始寻找更好的生活。但在旅途中他们发现，人类的历史就是一部暴力的谱系。片名指的是动物世界中我们最亲密的表亲之一黑猩猩的动物学名称。