AGU: Border Patrol Books in Order
Part ofThomas DePrima Books in OrderTrack Thomas DePrima's AGU: Border Patrol novels in order, with short summaries, series background, and guidance on how Sydnee Marcola's missions connect to the main A Galaxy Unknown story.
Last updated: January 13, 2026
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Publication Order
3 books
Clidepp Deja Vu
by Thomas DePrima
2016
Given command of a covert mission back into Clidepp space, Sydnee Marcola expects a quick in and out delivery. Instead her tiny ship becomes the spearhead for a long clandestine incursion, with Marines and fighter pilots aboard as civil war and great-power schemes swirl around them.
Clidepp Requital
by Thomas DePrima
2014
After a brutal encounter near the Clidepp border leaves her ship limping home, Sydnee Marcola faces a formal inquiry into the risky choices she made. At the same time, Clidepp rebels target a major Alliance trade conference, dragging her into a hunt for terrorists that politics may not allow to succeed.
Citizen X
by Thomas DePrima
2012
Sydnee Marcola worked herself to the top of her class hoping to serve under Admiral Jenetta Carver in Region Two. Instead she is sent to a sleepy border patrol command where nothing exciting is supposed to happen, right up until trouble arrives from just beyond Alliance space.
Series background & context
AGU: Border Patrol shifts the focus from admirals and grand strategy to the officers stuck on the thin line between Alliance space and its neighbors. The series follows Lieutenant Sydnee Marcola, a driven young officer whose dream posting under Admiral Jenetta Carver is derailed when she is sent to a quiet border command that is supposed to be boring.
In Citizen X, that backwater assignment turns out to be anything but. Syndicates, smugglers, and foreign powers treat the frontier as a playground, and Sydnee discovers that the posted rules do not always match what it takes to keep a station and its people alive.
As the books move into Clidepp Requital, her work pulls her deep into the tangled politics of the Clidepp Empire. Rebel groups and oligarchs both try to use Alliance space as a stage for their grievances, culminating in a terrorist attack that puts civilian leaders from across the galaxy at risk and forces Space Command to decide how far it will go to strike back.
Clidepp Deja Vu sends Sydnee and her handpicked crew on an extended covert mission right into Clidepp territory. What begins as a focused operation quickly expands into a long-term infiltration, with Marines, fighter pilots, and intelligence specialists all working under thin cover while civil war brews around them.
Border Patrol stories lean into cat-and-mouse encounters, customs inspections that can turn violent without warning, and the ugly side of interstellar politics where smugglers, terrorists, and splinter militaries all crowd the same corridors. The stakes are smaller than a full galactic invasion, but every bad call can still mean a destroyed convoy or a war nobody wanted.
Sydnee herself is more hands-on than a distant flag officer. She is expected to make judgment calls with little guidance, bend or break regulations when lives are on the line, and live with the aftershocks when admirals and diplomats review her reports months later. Fans of Jenetta Carver will see familiar names, ships, and events from a different angle, but Border Patrol can also be read on its own as a sequence about a front line officer learning how messy keeping the peace can be.
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