"The Fire Within" is a documentary by Werner Herzog about French volcanologists Katia and Maurice Krafft, who were consumed by their love for volcanoes. The film showcases their footage and photography of volcanic eruptions, showcasing their achievements and passion. Herzog's film is a requiem to the couple, fuelled by heavy instrumental and choral music, highlighting their life and achievements while barely dwelling on the accusations that they provoked dangerous situations. The documentary shows the Kraffts' surreal footage from around the world, featuring volcanic eruptions and nature's creatures, with one last powerful glimpse at two people joyfully following their passion into the belly of the beast.