Meanwhile, FBI investigations into the murders of a congressman and his staff uncover a shocking link to Grace’s abduction, threatening international stability.

Desperate to survive, Grace allies with an unlikely partner—a child who knows the bunker’s secrets—but as they navigate the treacherous tunnel system, a misplaced step echoes through the corridors, alerting a deranged captor who now closes in, gun in hand.

If you like Alex Cross, Gabriel Allon, you will like this unpredictable, fast-paced suspense thriller.

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About the Author

S.F. Baumgartner writes fast-paced Christian suspense thrillers. Book 1 of her Mirror Estate series, Living Secrets, was selected as one of the Top Picks in the thriller category at Killer Nashville, 2024. Her love for writing comes second only to her love of reading. When she’s not busy writing about complex characters, secretive operatives, and relentless agents, she spends her time binge-watching crime TV shows, such as NCIS, or playing with her cats. If you enjoy James Patterson’s style—specifically short chapters—you’ll love her Mirror Estate series.

More from S.F.

I’m so excited to share Hidden Secrets, the fourth book in my Mirror Estate Psychological Thriller series. For those who’ve been following Grace Benson’s story, this is the next chapter in her journey—a deeply personal one with plenty of the twists, danger, and suspense you’ve come to expect from my writing.

If you’ve read Tangled Secrets, you know that Grace finally uncovered the truth about her birth mother. That revelation opened doors to even more questions, and in Hidden Secrets, she takes the next step: discovering the identity of her birth father. Of course, in Grace’s world, nothing is ever simple. This isn’t just a straightforward search for a man from her past—it’s a journey wrapped in danger, deception, and murder.

Writing this book was such an adventure for me. Grace is a character I’ve grown to love, and putting her through these intense, high-stakes situations is always a mix of excitement and challenge. This time, she’s dealing with abduction, espionage, and a web of lies that keeps tightening around her. Every step she takes toward the truth comes with a cost, and watching her face these challenges while staying true to herself was as rewarding to write as I hope it is for you to read.

But I’ll admit, Hidden Secrets didn’t come together without a few struggles. I rewrote several scenes to make sure the story flowed the way it needed to. The pacing, the tension, and the timing of the twists had to be just right. I love keeping readers on the edge of their seats, but it takes some effort to make sure every piece falls into place.

One of the things I think makes this book stand out is how personal it is for Grace. Yes, there’s plenty of action, danger, and intrigue, but at its core, this story is about family and identity. Grace’s search for her father forces her to confront parts of herself she didn’t even know were missing. I wanted readers to feel that emotional depth while still delivering the suspense and surprises that make a Mirror Estate thriller what it is.

The reviews so far have been incredible. Hearing that readers are loving Grace’s latest journey means the world to me. Some have mentioned how much they appreciated the balance between the emotional moments and the fast-paced action, which makes me feel like all those rewrites were worth it!

If you’re already a fan of the series, I think you’re going to love where this installment takes Grace. And if you’re new to Mirror Estate, don’t worry—Hidden Secrets stands on its own. You’ll get plenty of context to enjoy the story, but starting at the beginning will definitely give you a richer experience.

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