Frontlines book cover

The Frontlines Series in Order

The Frontlines series must be read in order, starting with Terms of Enlistment, as the story follows a continuous narrative across the books. Andrew Grayson enlists in the North American military and rises through the ranks during humanity’s desperate wars against alien invaders known as the Lankies and internal political threats.

🔴 Must Read in Order · Start with Book 1

Frontlines Books in Order

10 books total 8 main + 2 extra stories

How to Read the Frontlines series

🔴 Must Read in Order · Start with Book 1

Read in order—each book builds directly on the previous one.

The Frontlines series must be read in order. The story follows a continuous narrative across all books, with events and character arcs carrying directly from one book to the next as Grayson’s career and the war escalate. Reading out of order causes confusion and major spoilers because later books assume full knowledge of earlier battles, promotions, and shifting alliances.

About the Frontlines series

Series Premise

The Frontlines series follows Andrew Grayson from raw recruit to seasoned officer in a future where Earth faces extinction-level threats. Each book advances the larger story of interstellar war, military politics, and personal sacrifice in humanity’s fight for survival.

Main Characters

Andrew Grayson serves as the central protagonist, progressing from enlisted soldier to high-ranking officer. He is supported by recurring comrades and superiors whose roles and relationships evolve throughout his military journey.

Setting

The series is set in a gritty, near-future world spanning overpopulated Earth cities, orbital stations, and distant colony worlds, where humanity fights for survival against superior alien forces.

Tone & Themes

The tone is realistic and intense military science fiction with strong character focus. Central themes include duty and sacrifice, the brutality of war, leadership under pressure, and the resilience of ordinary people in extraordinary circumstances.

Is This Series Worth Reading?

This series appeals to readers who enjoy realistic military science fiction, character-driven war stories, and detailed depictions of future combat and politics. It suits fans of authors like Tom Clancy or Marko Kloos’s own style who want grounded, high-stakes action.

Content Warnings and Heat Level

Strong violence and realistic depictions of war; some strong language; suitable for adult readers.

The Frontlines series delivers one continuous story of a soldier’s rise during humanity’s darkest wars. Its sequential structure builds deep investment in Andrew Grayson and the larger conflict. The blend of tactical action, political intrigue, and human resilience creates a compelling military science fiction saga.

FAQ

How many books are in the Frontlines series?

10 books total: 8 main + 2 extra stories

When will the next book in the series be released?

No new book is currently scheduled. The latest book, Centers of Gravity, was published in September 2022.

When was the most recent book released?

Centers of Gravity was published in September 2022.

What was the first book in the series?

The first book in the series is Lines of Departure, published in February 2014.

What genre is the Frontlines series?

The series primarily falls into the Science Fiction genre.

Do you need to read the Frontlines series in order?

Yes, the series should be read in order. The books follow a continuous story, starting with Lines of Departure.

What is the Frontlines series about?

The Frontlines series follows Andrew Grayson from raw recruit to seasoned officer in a future where Earth faces extinction-level threats. Each book advances the larger story of interstellar war, military politics, and personal sacrifice in humanity’s fight for survival.

Is the Frontlines series finished?

The series does not currently have a new book scheduled.