Volcanic lava can flow faster than you can run, even faster than you can drive; and this dense mass of burning ash and explosive gas has the potential to destroy everything in its path. For the residents of Monserrat, this nightmare is a reality. They live in the shadow of Soufriere, described as the most dangerous volcano in the world. What could possibly motivate these people to stay? Vulcanologist Mark Davies watches Soufriere daily and by monitoring ‘the dragon’s pulse’ he can make predictions that could mean difference between life and death. Monserrat’s Governor Savage wants to move the community out of the volcano’s shadow to the north of the island. For one English couple though it is already too late, their house was destroyed in the 1995 eruption.