It isn't every day that one of the creators of a political thriller gets to ask its real-life protagonist to evaluate the novel's plot.

But that happened when the late Billy Wireman, president of Queens University in Charlotte, N.C., handed the last Soviet Union leader a copy of "The Secret Diary of Mikhail Gorbachev." The 1990 novel was written by journalist Frye Gaillard, based on a Wireman idea.

The plot: There were spiritual motivations behind "glasnost" and "perestroika," Gorbachev's risky ideas to restructure Soviet life. But furious KGB insiders -- including a would-be assassin -- managed to steal Gorbachev's diary, in which he confessed his Christian faith.

Wireman wrote down Gorbachev's response after hearing the book's premise: "You must have been reading my real diary."

This faith question never vanished, no matter how often Gorbachev reaffirmed his atheism, while also stressing his respect for the beliefs of his Communist father and devout Russian Orthodox mother. His maternal grandparents hid holy icons behind their home's token Vladimir Lenin portraits.

Gorbachev died on August 30 at age 91 and his funeral was held in the Pillar Hall of Russia's House of the Unions, after President Vladimir Putin denied him a state funeral. He was buried next to his wife Raisa, who died in 1999 of cancer, in the cemetery of Moscow's Novodevichy Convent.

"Regardless of the geo-political realities of that era, there was something going on inside Gorbachev," said Gaillard, writer in residence at the University of South Alabama in Mobile and former Southern editor of The Charlotte Observer. He is the author of 30-plus books, including "A Hard Rain: America in the 1960s," which won the 2019 F. Scott Fitzgerald Literary Prize.

"Why did he do it? That's the question that won't go away," Gaillard added. "That's what has fascinated people for decades and it still does. We may never know now that he's gone. … But all that speculation about his beliefs is at the heart of the book."