John Barron/Nicholas Marten Books in Order

The John Barron/Nicholas Marten books are Allan Folsom's linked run of big international thrillers. They start in police territory and then keep widening the map, from Los Angeles and London to continental Europe, Africa, and the corridors around the U.S. presidency.

At the center is John Barron. In The Exile, he begins as the youngest member of the LAPD's elite 5-2 squad, a unit with a fearsome reputation and a private sense of justice. A train operation against killer Raymond Thorne shows Barron that the people on his side may be just as dangerous as the criminal they are chasing. When he pushes back, his life starts to come apart.

Survival means becoming Nicholas Marten.

That new identity gives the series its shape. Marten is a former detective trying to stay alive after he has seen too much, said too much, and crossed people who do not forget. He is smart, stubborn, and often badly outmatched. Folsom keeps him moving through airports, safe houses, old cities, and official buildings where no one is quite as safe as they look.

The Machiavelli Covenant raises the stakes from personal danger to world politics. Marten comes out of hiding after the death of a former girlfriend and her family, and his search leads toward a secret bioweapons program. At the same time, U.S. President John Henry Harris is running from enemies inside his own world. With French photojournalist Demi Picard drawn into the chase, the book turns into a fight against a rich, violent brotherhood built around a hidden Machiavelli manuscript.

By The Hadrian Memorandum, Marten is trying to make a quieter life in England as a landscape architect. It does not last. A huge oil discovery off Equatorial Guinea pulls him into a plot involving mercenaries, corporate power, a brutal government, and a secret agreement that could cost thousands of lives. Harris, now one of the few people Marten can trust, becomes part of the danger again.

These are not quiet puzzle mysteries. They are chase thrillers with assassins, betrayals, fake-safe allies, high body counts, and heroes improvising while powerful people close ranks. The thread connecting the three books is simple and sturdy: Marten keeps finding rot inside systems that are supposed to protect people, and once he sees it, he cannot look away.