This is the story of the man without whom the name Charles Darwin might be unknown to us today. That man was Captain Robert FitzRoy, who invited the 22-year-old Darwin to be his companion on board the Beagle .

This is the remarkable story of how a misguided decision by Robert FitzRoy, captain of HMS Beagle, precipitated his employment of a young naturalist named Charles Darwin, and how the clash between FitzRoy's fundamentalist views and Darwin's discoveries led to FitzRoy's descent into the abyss.

One of the great ironies of history is that the famous...