The deadliest storm in modern history ripped Pakistan in two and led the world to the brink of nuclear war when American and Soviet forces converged in the Bay of Bengal. In November 1970, a storm set a collision course with the most densely populated coastline on Earth. Over the course of just a few hours, the Great Bhola Cyclone would kill 500,000 people and begin a chain reaction of turmoil, genocide, and war. The Vortex is the dramatic story of how that storm sparked a country to revolution.