This audiobook is unique. Riley Black describes the events of the mass extinction of the Cretaceous period using specific examples of animals to help listeners imagine what was happening. We follow the heroes through different periods of their lives: an hour, a day, a month, a year, a century, and up to a million years after a collision of a planet with an asteroid. The author describes the challenges faced by various dinosaur species, giving listeners a sense of what their lives were like. At the end of the audiobook, Black provides commentary explaining what of what he describes corresponds to scientific facts and what is his speculation.