'Duck Dynasty' Stars Reveal the One Struggle That Had Them Questioning God

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In her new book, Blessed, Blessed... Blessed, Duck Dynasty star Missy Robertson gets candid about keeping her faith in the face of adversity.

Together with her husband, Jase Robertson, the couple opens up about daughter Mia's ongoing health struggles. The 12-year-old was born with cleft lip and cleft palate and has undergone several major surgeries already in her young life.

"I really tried to be open and honest even with my emotions in the book," Missy tells ETonline. "Even though our lives are displayed on TV, each show has a beginning, a middle and an end, and it's all wrapped up in a pretty package and a funny package each week -- but there's not a whole lot of funny in this. There are some wow moments about how she reacts and just how our family pitched in, and there are some funny instances about when we're first married, but it's not a humorous book because it's a serious subject."

WATCH: Jase & Missy Robertson Open Up About the Duggar Controversy 

In Blessed, Blessed... Blessed, Missy candidly reveals her shock and concern in learning about her daughter's condition in an ultrasound during her pregnancy. Speaking with ETonline, Missy admits it was the one time that she called God into question.

"I did question God at the beginning like, 'Wait a minute, what just happened here? I thought I'm one of your children. You're not supposed to leave me. Did you turn your back for just a second and get disoriented or distracted with someone else's problems and forget about me for a second?'" Missy says. "But going along this journey, I realized he never left us, not one time. This is all part of a bigger plan and Mia is a huge part of his plan, and that's what we have to fulfill."

Jase and Missy say that Mia has not yet read the book, but that it was her idea to share her story with the world. As viewers of Duck Dynasty may recall, Mia penned a speech about her own journey and shared it with the world on a March 2014 episode of the show titled "Stand By Mia."

"Her demeanor is so positive, and I think that's what gives a lot of inspiration," says Missy.

WATCH: Jase & Missy Robertson's Romance Advice and Hopes for Their Kids 

"We're amazed by the details of her journey and that's what this book is about, because a lot of times we're thinking that she's just gonna be a basket case when this happens," adds Jase, "and then what turned out, we were the basket cases and she was the strong one despite what she was going through.

"I mean, on several occasions she's like, 'I don’t know why these people are saying I have struggles and problems. I'm perfectly fine,'" the father of three continues. "We're amazed when she says that because we're like, 'You've had quite a few struggles,' but she just doesn't look like that. I think when you turn it into a positive, the sky's the limit in terms of what you can do."