"When I was a boy listening to an invitation to adventure, I had no idea it would be so painful," writes Daniel Walker in God in a Brothel: An Undercover Journey into Sex Trafficking and Rescue (InterVarsity, 2011). "But I also failed to understand why it was that this grace was so amazing and how it could be that this unlikely gift would ultimately triumph over my fear and shame."

In his heartbreaking yet hopeful story, Walker recounts his own experiences as an undercover detective, reminding the church to engage modern-day slavery. "Slavery is an inherent part of our Christian heritage, going back to the Garden of Eden where humanity was enslaved, right through to the greatest abolitionist, Jesus, who sets us free [and] seeks us out as free beings to set others free," Walker told me on a recent visit to Christianity Today.

Walker talked to me about his book (which is being sponsored by Compassion International and Hagar International as part of the Anti-Trafficking Tour) and how he came to see that Christians are "bearers of the most wild, dangerous, untamed force for good in the world."

One of the things I appreciated about your book is that you humanized men who purchased sex, noting that they too are enslaved.

There are books from people doing undercover work who say, "These are despicable, disgusting lowlifes." And they are. But it's easy to forget that we were all slaves and we're set free. They're enslaved by something that's much more visible.

What are ways to help men escape this form of slavery?

[In my former detective work,] we were holding people accountable for the evil they did, which ultimately we believe sets them free. By bringing them face to face with the injustice they perpetuated, they have two choices: they ...

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