Sekret Machines Books in Order

The Sekret Machines novels, written with Tom DeLonge, sit in an interesting spot between science fiction and conspiracy thriller. They are built around the idea that unexplained aerial phenomena, hidden technology, and buried pieces of history may all be connected, and that people in power have been managing that knowledge for a very long time.

These are not quiet, one-location mysteries. The series moves through military secrecy, government programs, old incidents that refuse to stay buried, and the personal damage done by living close to information no one is supposed to have. The books like large patterns, competing agendas, and the feeling that every answer opens three more locked doors.

What makes the series distinct is the blend of registers. One moment it leans into archeological adventure or historical puzzle, the next it is dealing with covert operations, strange craft, or questions about what human beings may have misunderstood for generations. Hartley's side of the partnership gives the fiction shape and momentum, while the larger project around the books gives them their speculative charge.

These books like classified files, but they move like thrillers.

If you are coming in fresh, expect multiple players rather than a single cozy detective lead. Soldiers, insiders, researchers, and shadowy operators all matter, because the story is less about solving one neat case than about tracing a system of secrecy. The tension comes from how much is hidden, who benefits from the hiding, and what happens when scattered people start seeing the same impossible pattern.

That means the appeal is not just aliens or hardware. It is atmosphere, suspicion, and scale. The books ask you to imagine a world in which official history is only the visible layer, and where old events may look very different once you start fitting them together. If that mix of UAP lore, secret-history fiction, and high-stakes chase story sounds fun, this is the lane Hartley and DeLonge are working in.