Threshold isn’t just for thriller fans—it’s for readers who love high-stakes suspense, rich historical connections, and a touch of the extraordinary.
✔️ If you love books that mix modern conspiracies with lost histories, this is for you.
✔️ If you enjoy fast-paced action with characters you truly care about, you’ll be hooked.
✔️ If you’re fascinated by assassination plots, political intrigue, and hidden connections to the past, you won’t put this down.
✔️ If you want the gripping tension of a Bourne thriller but with deep friendships, found family, and emotional depth—this is your next read.
The explosion. Iraq.
Marine Captain Cat Fahey thought her life ended that day. She’s haunted by visions she can’t explain—visions that feel more like memories. Night after night, she sees a hand reaching for her, pulling her back from death. But when she wakes, she’s homeless in Philadelphia, carrying only one truth:
Someone powerful is about to be assassinated.
And she’s the only one who can stop it.
She needs help. There’s only one person who might believe her.
She has to find Key Murphy.
When Key Murphy is urgently called back to Philadelphia, he learns the impossible:
➜ The Vice President of the United States is the target of a deadly plot.
➜ The people behind it are hidden in the shadows, pulling strings, and erasing anyone in their way.
➜ The only lead? A former Marine captain who claims she saw the attack before it happened.
As Key, Arin, and their team follow a trail of secrets that spans centuries, they realize this conspiracy isn’t just political. It’s personal.
The past and present are colliding once again. And this time, the stakes couldn’t be higher.
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“A pulse-pounding and electrifying assassination thriller—the explosive action will blow your mind!” —Goodreads Review
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“Kevin Barry O’Connor masterfully blends historical depth with relentless pacing. If you love thrillers with substance, this one’s for you.” —Goodreads Review
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“The balance of love, sturdy relationships, and optimism in the face of chaos is what makes this book so enjoyable. It’s tense, thrilling, and impossible to put down.” —Goodreads Review
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“THRESHOLD is a thought-provoking, well-researched, and at times terrifying ride—I couldn’t put it down!” —Goodreads Review
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“A sophisticated and stylish thriller with twists that will leave you breathless. The intricate storytelling makes this a must-read.” —Goodreads Review
Kevin Barry O’Connor, author of the genre-bending Key Murphy series, blends cozy thrillers, historical intrigue, and sci-fi twists to create unforgettable stories. Explore riveting novels, stay inspired with storytelling wisdom, and join the journey of adventure, mystery, and timeless tales.