The Bloody Sun

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The Bloody Sun is a science fiction novel by Marion Zimmer Bradley in her Darkover series. It was first published by Ace Books in 1964. The novel was substantially rewritten, expanded, and republished under the same title in 1979; Bradley's short story "To Keep the Oath" was included in this edition and all subsequent reprintings.
The expanded rewrite retains the basic plot structure but is more closely connected to several other Darkover books, especially The Forbidden Tower. It also changes the identity of one of Kerwin's parents, although the later book Exile's Song uses his textually original parentage as background information.