Iron Gold - Red Rising, Book 4

Darrow was born a slave. He became a weapon.
He ended centuries of Gold rule, broke the chains of an empire, and now he's the hero of a brave new republic. But at terrible cost.
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At the edge of the solar system, the grandson of the emperor he murdered dreams of revenge.
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In his hidden fortress in the oceans of Venus, the Ash Lord lies in wait, plotting to crush the newborn democracy.
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And, at home, a young Red girl who's lost everything to the Rising questions whether freedom was just another Gold lie.
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In a fearsome new world where Obsidian pirates roam the Belt, famine and genocide ravage Mars, and crime lords terrorise Luna, it's time for Darrow and a cast of new characters from across the solar system to face down the chaos that revolution has unleashed.