Jeanine Pirro, the Westchester County district attorney turned television judge, is less than three weeks away from the release date of what she hopes will be a blockbuster book: “He Killed Them All: Robert Durst and My Quest for Justice.”

The book is not available yet, but promotional material promises that it will reveal “stunning, previously unknown secrets about the crimes” Mr. Durst, the peculiar scion of a New York real estate family, is accused of committing. Those crimes include the 1982 disappearance of his first wife and the 2000 murder of a former confidante in Los Angeles. In 2000, Ms. Pirro’s office reopened the 18-year-old inquiry into his wife Kathleen’s disappearance.

Mr. Durst’s story is stuffed with details — enormous wealth, a murder mystery, cross-dressing, the dismemberment of an elderly neighbor whose head is still missing, a second wife who lives with one of his lawyers — that have inspired books, television specials, a feature film and an Emmy Award-winning documentary, “The Jinx: The Life and Deaths of Robert Durst.”

But Ms. Pirro’s book, to be released by Simon & Schuster/Gallery Books on Nov. 3, is inspiring some drama of its own.