The works of John le Carré, who died in 2020, are among the most beloved thrillers of all time. For some, books like "Tinker, Tailor, Soldier, Spy," "A Perfect Spy" and "The Spy Who Came in From the Cold" are simply among their favorite works of literature ever.

So it was a perilous task that author Nick Harkaway, one of le Carré sons, set out for himself. The author of multiple well-received science fiction novels, Harkaway picked up the torch from his father to write a new tale starring George Smiley, the Cold War spy who has appeared in more than a half dozen novels. According to Harkaway, it took some work to figure out the right period to set the book in.

"Smiley's career is a little bit tricky in terms of the continuity because my dad, when he was writing these books, wasn't writing a franchise," Harkaway said. "He was writing one book after another, and each one was the only truth that he cared about."

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