Disaster on the Horizon is a behind-the-scenes investigative look at the worst oil well accident in US history, which led to the current environmental and economic catastrophe on the Gulf Coast. Cavnar uses his 30 years in the business to take readers inside the disaster, exposing the decisions leading up to the blowout and the immediate aftermath. It includes personal accounts of the survivors, assembled from testimony during various investigations, as well as personal interviews with survivors, witnesses, and family. It also provides a layman's look at the industry, its technology, people, and risks. It deconstructs events and decisions made by BP, Transocean, and the US Government before and after the disaster, and the effects of those decisions, both good and bad.

Cavnar explains what happened in the Gulf, explores how we arrived at deep water drilling in the first place and then charts a course for how to avoid these disasters in the future.