There are 4 books in the Planetside series. The newest book is Darkside which came out in 2024.

1
Planetside

Book cover of Planetside

"Planetside is a smart and fast-paced blend of mystery and boots-in-the-dirt military SF that reads like a high-speed collision between Courage Under Fire and Heart of Darkness." - Marko Kloos, bestselling author of the Frontline series

A seasoned military officer uncovers a deadly conspiracy on a distant, war-torn planet...

War…

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2
Spaceside

Book cover of Spaceside

From the author of Planetside, a Best Book of 2018 (Library Journal)

A military legend is caught in the web between alien intrigue and human subterfuge...

Following his mission on Cappa, Colonel Carl Butler returns to a mixed reception. To some he is a do-or-die war hero. To the other…

3
Colonyside

Book cover of Colonyside

A missing scientist and deep pockets pull Colonel Carl Butler out of retirement, investigating another mystery that puts him and his team--and the future of relations with alien species--in danger in COLONYSIDE, the exciting follow-up to Planetside and Spaceside.

A military hero is coming out of disgrace-straight into the line…

4
Darkside

Book cover of Darkside

In this thrilling, action-packed fourth installment in the Planetside series from acclaimed science fiction author Michael Mammay, retired Colonel Carl Butler gears up for another military investigation, full of danger, corporate intrigue, and tech people would kill for-perfect for fans of John Scalzi and Craig Alanson.

Colonel Butler has paid…