Implacable (#3)

Previous: Resolute (#2)

Admiral John “Black Jack” Geary fears the greatest threat to humanity may be itself in this gripping continuation of the New York Times bestselling series.

As far from explored space as any human has ever been, Geary and the Alliance fleet are on their own, protecting a diplomatic mission in territory belonging to an alien species with still-unknown motives.

His already complex and dangerous mission is further imperiled by deadly challenges from other human factions seeking to harm or exploit the aliens. When another alien species whose technology is far more advanced than humanity’s arrives, the stakes are raised to the highest possible level.

Only the most serious danger comes from an unexpected source.

Presented with orders to carry out actions he believes not only are mistaken, but would be contrary to the ideals of the Alliance, Geary has to decide whether he must invoke the power that his long-revered name holds–even though this might endanger his entire fleet, tear apart the Alliance, and destroy everything he has fought for.


"Overall, this is a tense and exciting science fiction thriller that kept me on an emotional rollercoaster. It was engaging, atmospheric, and suspenseful and did a great job of keeping me hooked. I can't wait to see what happens next."

Mystery & Suspense

"For those who have journeyed through the preceding installments, Implacable is a tantalizing treat, serving up another thrilling chapter in Geary's saga [...] I assure you the voyage through the series to this point will be worth every light-year. Campbell's series comes highly recommended, and Implacable shines brightly among its celestial brethren."

Game Vortex

"Geary is outstanding in the military missions and commanding the fleet, but he is also a great strategist and is learning politics and diplomacy."

Books of My Heart