Jack Stewart and Chad Robichaux return with Riptide, the second installment in their Silent Horizons series. Former Force Recon Marine Foster Quinn remains at the center of the narrative, though this entry pushes him further into the shadows than ever before. By teaming up with the wealthy Sterling Beaumont, Quinn works to dismantle a conspiracy of elites who profit from keeping the United States entangled in endless global conflicts.

A shadow war rages. Only one man can drag it into the light.

Still haunted by his former teammate’s betrayal and the unveiling of a conspiracy that runs deeper than he imagined, Foster Quinn is once more thrust back into the world he thought he left behind. In the sweltering heat off the coast of Key West, a mission to seize a billionaire’s yacht ends in a chilling revelation: America’s enemies aren’t just beyond our borders—they might be sitting in Congress.

When a powerful Texas businessman recruits Foster to investigate the political malfeasance behind the death of his son, Foster is pulled into a web of corruption that leads him from a luxury megayacht in the Caribbean to a tech mogul’s grand estate in the Pacific Northwest. As he hunts down the men pulling the strings, Foster must resist the temptation in his search for justice to be swept away by revenge. He’ll need all his training and resilience to unravel a plot driven by greed and masked by patriotism. Especially when the war becomes personal, and he realizes it’s coming to his own turf.

Tactical Exercises to Global Conspiracy

The story begins with a training exercise alongside a team of Navy SEALs, but the scope quickly expands. Quinn’s mission takes him from the Florida Keys and Sint Maarten to the Pacific Northwest and Canada. The technical details are handled with precision: whether Quinn is re-breather diving, parachuting, or navigating private jets and sea planes, the operational aspects feel authentic.

While his initial goal is personal, seeking justice against Dmitri Tarasov, the man who captured and tortured him in the first book, the mission spiraling into a wider web of corruption forces Quinn to confront multiple adversaries across the globe.

A World of Gray

The antagonists in Riptide are effective because they tap into a very modern sense of cynicism. Quinn’s deep mistrust of political motivations feels timely, as he attempts to do the right thing in a world where more and more people are stepping over moral lines.

His internal struggle is just as intense as the physical combat. Quinn is still battling the psychological aftermath of his previous captivity, and the recurring necessity of leaving his wife, Rebecca, and daughter, Haili, adds a heavy emotional cost to his work.

My Verdict

Quinn’s internal battle remains the core of the series, expanding to include Quinn’s relationship with Stirling Beaumont as a surrogate father figure. However, much like the first novel, the ending avoids a neat or traditional resolution. While I hoped for a bit more closure regarding Quinn’s personal journey in this volume, the open-ended conclusion makes it clear that his fight is far from over.

The action is first-rate and delivered with the tactical intensity that has become a hallmark of Jack Stewart’s writing. For fans of thrillers that balance hardware and heart, Riptide is a compelling follow-up.