“The Final Spark,” the last installment of the Michael Vey series by “Christmas Box” author Richard Paul Evans, was released Tuesday. The bestselling novelist joined Glenn on radio to talk about the seventh Michael Vey book, his inspiring fans and the strange and wonderful journey to the conclusion of his story about a boy with a mysterious power.

When he first started shopping around the idea for the series, Evans was told by publishers that it was “too smart to be a kid’s book.”

“Don’t ever underestimate the youth,” Glenn remembered telling Evans as he introduced the author on Tuesday’s show. He shared his perspective on the books as a dad who has read each new installment with his son.

“Every summer we read it,” Glenn said. “He’s grown up with this now, and … it’s still as relevant to him now [in his early teens].”

“It’s by far the most complex thing I’ve ever written,” Evans said of the series, explaining how elements in the first book that he at first didn’t understand later became relevant in “The Final Spark.”

This article was originally published on GlennBeck.com.