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Frontlines — by Marko Kloos
Frontlines Series in Order: 10 books
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Terms of Enlistment
Book - 1
The year is 2108, and the North American Commonwealth is bursting at the seams. For welfare rats like Andrew Grayson, there are only two ways out of the crime-ridden and filthy welfare tenements, where you're restricted to two thousand calories of ba...
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Lines of Departure
Book - 2
Vicious interstellar conflict with an indestructible alien species. Bloody civil war over the last habitable zones of the cosmos. Political unrest, militaristic police forces, dire threats to the Solar System... Humanity is on the ropes, and after...
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Lucky Thirteen
Book - 2.1
The story of rookie pilot Lt. Halley's first drop ship command. (A short story in the Terms of Enlistment universe.)...
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Measures of Absolution
Book - 2.2
In the aftermath of the Battle of Detroit, Corporal Jackson finds out how the 365th AIB got a mauling in the Public Residence Clusters, and why the Territorial Army may have lost control over a big chunk of Detroit. A novella in the Terms of Enlistme...
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Angles of Attack
Book - 3
The alien forces known as the Lankies are gathering on the solar system's edge, consolidating their conquest of Mars and setting their sights on Earth. The far-off colony of New Svalbard, cut off from the rest of the galaxy by the Lanky blockade, tee...
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Chains of Command
Book - 4
The assault on Earth was thwarted by the destruction of the aliens' seed ship, but with Mars still under Lanky control, survivors work frantically to rebuild fighting capacity and shore up planetary defenses. Platoon sergeant Andrew Grayson must cras...
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Fields of Fire
Book - 5
The time has come to take the fight to the Lankies. Mars has been under Lanky control for more than a year. Since then, the depleted forces of Earth's alliances have rebuilt their fleets, staffing old warships with freshly trained troops. Torn bet...
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Points of Impact
Book - 6
Humankind may have won the battle, but a new threat looms larger than ever before... Earth's armed forces have stopped the Lanky advance and chased their ships out of the solar system, but for CDC officer Andrew Grayson, the war feels anything but...
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Orders of Battle
Book - 7
The battle against the Lankies has been won. Earth seems safe. Peacetime military? Not on your life.It’s been four years since Earth threw its full military prowess against the Lanky incursion. Humanity has been yanked back from the abyss of ex...
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Centers of Gravity
Book - 8
Stranded light-years from home, Major Andrew Grayson and his crew are on a desperate mission to discover the Lankies’ secrets. They can’t let what they’ve found die with them.Nine hundred light-years from home, Major Andrew Grayson ...
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.
Frontlines Series Reading Order
🔴 Must Read in Order · Start with Book 1: Terms of Enlistment
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.
Explanation of reading order types
Frontlines Series 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 of the Frontlines Series
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 of the Frontlines Series
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 the Frontlines 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.
Books in this series fall into the following genres
Genres
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Themes
People / Creatures