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Sin Undercover: A Paranormal Romantic Suspense
Paperback
Series: Badges & Brimstone: A Demons & Detectives Romantic Suspense, Book 3
Publisher: Independently Published
Published: Jul 24 2026
Pages: 464
Weight: 1.22
Height: 1.15 Width: 6.00 Depth: 9.00
Language: English
Nina Calder knows how to go undercover.
Fake smile. Fake name. Real instincts.
But this case isn't built on cash or confession. It's built on paperwork.
In Cinderport, a trail of perfectly acceptable outcomes-dismissed charges, vanished complaints, sealed misconduct-leads to one place: Eidolon Social, a private members' club where the powerful come to sin safely...and leave with the record on their side.
Nina is ordered in under a cover that requires one thing she hates: signing. Waivers. pledges. discretion forms that feel like velvet until they tighten. The city won't even say Eidolon's name on record, but they want it neutralized before it turns the whole justice system into a receipt.
Her only advantage is the one thing she doesn't trust.
A translator.
Asher Rook is charming, calm, and impossible to rattle-because he's not human, and he knows exactly how contracts hunt. He can hear the cadence in a sentence meant to trap her. He can spot the loopholes in a form meant to own her. And the longer they play fake couple in a room full of signatures, the more Nina realizes the most dangerous part of this assignment isn't the club.
It's what the city is willing to authorize to keep its outcomes clean.
To survive Eidolon, Nina will have to do the unthinkable: tell the truth without giving the system her consent, build a record that can't be rewritten, and choose who she trusts when the paper starts answering back.
Because in this city, a signature isn't just ink.
It's jurisdiction.
Readers search for: police paranormal romance, demon romance, undercover romance, romantic suspense mystery, forced proximity, fake couple undercover, morally gray MMC, competent heroine, secret society club, corrupt city officials, institutional conspiracy, only one who understands, closed-door-to-soft-open-door romance, urban fantasy thriller, procedural noir.
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