An international team of scientists is on a mission to unlock the hidden secrets of Mt. Nyiragongo, an active volcano in the Democratic Republic of Congo. They want to collect a fresh sample from the deadly yet mesmerizing lava lake at the volcano's heart-- a sample they will use to predict the volcano's future eruptions and potentially help the 2 million people who live in its path. Along the way, a host of deadly obstacles threaten their expedition, from the rebel troops camping on the flank of the volcano, to the perils of a 600 meter vertical climb into the volcano, to the roiling lava itself.