In the forested depths of eastern Congo lies Virunga National Park, one of the most bio-diverse places in the world and home to the last of the mountain gorillas. In this wild, but enchanted environment, a small and embattled team of park rangers - including an ex-child soldier turned ranger, a carer of orphan gorillas and a Belgian conservationist - protect this UNESCO world heritage site from armed militia, poachers and the dark forces struggling to control Congo's rich natural resources. When the newly formed M23 rebel group declares war in May 2012, a new conflict threatens the lives and stability of everyone and everything they've worked so hard to protect.