FBI Agent Constantine Striker Books in Order

These books pair FBI Agent Constantine Striker with Alex Frost, and that mismatch is what gives the series a lot of its tension. Striker is experienced, obsessive, and badly scarred by a case he never truly left behind. Frost is newer, sharper in different ways, and forced to learn quickly that working with Con means stepping into unfinished grief and real danger.

At the center of the series is the old Sandman case and the disappearance of Striker's twin sister, Valerie. Even when the team is working what looks like a fresh investigation, film piracy, missing girls, or a new violent threat, that older wound keeps pulling the story back toward itself. The result is a thriller series with a strong ongoing arc instead of isolated case files.

That obsession matters.

The books move through FBI territory but do not stay neat or procedural for long. Logan uses official investigations as an entry point, then pushes Con and Frost into moral gray areas, personal vendettas, undercover work, and choices that start to damage their careers as much as their enemies do. The pace is quick, but the emotional engine is grief, guilt, and the need for answers.

There is also a strong partner dynamic here. Frost is not just there to admire Striker or clean up after him. She pushes back, sees things he misses, and gives the series a second center of gravity. That keeps the books from becoming a single-note descent into obsession.

If you like FBI thrillers with missing-person cases, serial-killer fallout, and a long shadow from the past, this series is built for that.