Dark Valley Destiny: the Life of Robert E. Howard is a biography of the writer Robert E. Howard by science-fiction writer L. Sprague de Camp in collaboration with Catherine Crook de Camp and Jane Whittington Griffin, first published in hardcover by Bluejay Books in December 1983,[1][2] and in trade paperback by the same publisher in May 1986.

[1] An E-book edition was published by Gollancz's SF Gateway imprint on September 29, 2011, as part of a general release of de Camp's works in electronic form.

[1][3][4] The work, an examination of the famous fantasy writer and creator of Conan the Barbarian, was the first major independent biography of Howard.

De Camp's "warts and all" approach to his subject has been branded by some fans as unflattering and unbalanced.

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