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Frontlines Books in Order

Part ofMarko Kloos Books in Order

See all Frontlines books by Marko Kloos in order, with story summaries, reading order notes, and background on Andrew Grayson’s war with the Lankies.

Last updated: December 26, 2025

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Publication Order

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11 books

1

Echoes of Silence

by Marko Kloos

2025

When Andrew Grayson and his ship vanish on a classified mission, Halley is ordered to keep a personal journal. Told through her diary entries, this novella follows years of waiting, command challenges, and small daily moments that fill the long silence after someone goes missing.

2

Centers of Gravity

by Marko Kloos

2022

Marooned in a dark, distant system, Andrew Grayson and the crew of NACS Washington scout a lone moon that looks barely habitable. What they find there, from lifesaving resources to disturbingly adaptive Lankies, turns a rescue attempt into a hellish survival mission.

3

Orders of Battle

by Marko Kloos

2020

Four years after Earth’s narrow victory, Andrew Grayson is stuck behind a desk until a new offensive against the Lankies needs his skills. Aboard an Avenger class warship, he leads a strike deep into enemy space where one wrong move could doom the species.

4

Points of Impact

by Marko Kloos

2018

Humanity has pushed the Lankies out of the solar system, but the war is far from over. On Mars, Andrew and Halley lead exhausted troops in brutal tunnel fighting while new weapons shift the balance, forcing them to reckon with the cost of endless war.

5

Fields of Fire

by Marko Kloos

2017

With Mars under Lanky control, Earth’s alliances throw everything they have into a risky campaign to take it back. Andrew Grayson and Halley command green troops on the front line, where every landing zone, orbital strike, and mistake carries a deadly price.

6

Chains of Command

by Marko Kloos

2016

After the destruction of a Lanky seed ship gives Earth a brief breathing space, Andrew Grayson trains fresh recruits for whatever comes next. Sent on a covert mission to track down deserters with stolen warships, he discovers that human politics can rival any alien threat.

7

Angles of Attack

by Marko Kloos

2015

Cut off on the colony moon of New Svalbard, Staff Sergeant Andrew Grayson and a starving task force must slip through a Lanky blockade to reach Earth. A fragile alliance with former enemies turns their stealth mission into humanity’s most desperate gamble.

Recommended by:

George R. R. Martin

8

Lines of Departure

by Marko Kloos

2014

War and unrest are tearing humanity apart, from starving riots on Earth to a relentless alien offensive on the colonies. Reenlisted officer Andrew Grayson survives a disastrous assault only to be posted to a misfit-packed ship, where mutiny, invasion, and extinction all feel close.

9

Terms of Enlistment

by Marko Kloos

2013

In 2108, welfare kid Andrew Grayson sees only two ways out of his overcrowded slum: a colony lottery he’ll never win, or military service. Basic training, riot duty, and his first off world deployment quickly show that escaping poverty means facing even deadlier dangers.

10

Measures of Absolution

by Marko Kloos

2013

After the Battle of Detroit, Territorial Army corporal Jackson tries to understand how a routine pacification spiraled into catastrophe. Her search through ruined housing blocks and frightened civilians becomes a personal reckoning with guilt, orders, and what it really means to fight on home soil.

11

Lucky Thirteen

by Marko Kloos

2013

New dropship pilot Halley is handed an airframe with a cursed reputation and a serial number full of thirteens. On her first combat mission she has to decide whether to trust the data, her instincts, and the ship that every other pilot wants to avoid.

Series background & context

The Frontlines novels drop you into a late twenty second century where Earth is overcrowded, stratified, and ruled by big power blocs. The North American Commonwealth and the Sino Russian Alliance watch each other as much as they watch the stars. Ordinary people like Andrew Grayson grow up in crumbling welfare megablocks, dreaming of winning a colony lottery ticket or enlisting for a way out. When Andrew signs up for the service, he expects decent food and a paycheck, not history changing wars.

In Terms of Enlistment and Lines of Departure the series follows him from basic training through riot control in North American cities and early deployments off world. Readers see the familiar beats of military life, from barracks pranks to bad coffee, alongside ugly assignments like putting down unrest in poor districts. Then the rules change. Human rivalries are pushed aside when gigantic aliens dubbed Lankies begin seizing colonies and terraforming them for their own needs.

From Angles of Attack through Chains of Command and Fields of Fire, the books chart a grinding, years long war where humanity is consistently outmatched. Fleets are destroyed, Mars falls, and joint task forces with former enemies become the only realistic option. Andrew climbs the ranks from enlisted soldier to senior noncom, then officer, while his partner Halley moves from hotshot dropship pilot to seasoned commander. Short works such as Lucky Thirteen and Measures of Absolution fill in key side stories from the same conflicts.

Later volumes, including Points of Impact, Orders of Battle, Centers of Gravity, and the novella Echoes of Silence, push beyond set piece battles. The focus turns to what happens after a narrow victory, when the Lankies are pushed back from Earth but remain a looming danger. Andrew and Halley carry the weight of command, long separations, and the question of whether they can ever really stand down while an enemy that large is still out there.

What makes Frontlines stand out is its very grounded view of future war. Starships and orbital drops are present, but the heart of the series is in small units, logistics headaches, and the tension between orders and personal ethics. The books are fast to read yet willing to sit with consequences, whether that means a ruined city block on Earth or a ship’s crew facing the long, quiet terror of being stranded light years from home.

Throughout, the series keeps its eyes at trooper level, letting you feel what it is like to be one cog in a vast, chaotic interstellar conflict.

Edited by

Richard Reis

Software engineer whose passion for tracking book recommendations from podcasts inspired the creation of MRB.

Anurag Ramdasan

Lead investor at 3one4 Capital whose startup expertise and love for books helped shaped MRB and its growth.

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All 11 Frontlines Books in Order (Complete List 2026)