Humanity's greatest wars are over. Peace has finally arrived.

Former soldier Kael Vex has traded battlefields for asteroid mining, determined to leave violence behind. Explorer Chris Johnson and his wife Victoria are charting the stars, believing humanity's future lies in discovery rather than conflict.

Then Earth is invaded.

An ancient race calling themselves the Children of Gods emerges from deep space. The Nephilim-beings once believed to exist only in Scripture-return to reclaim humanity as their inheritance. Entire cities fall. Military leaders betray their own people. The strongest humans are captured and transformed into servants of an empire that has conquered worlds for millennia.

As Earth burns, Mars becomes humanity's final refuge.

Kael is drawn back into combat alongside Chris and Victoria, who race home from deep space carrying experimental transforming exosuits that may be humanity's only technological advantage. Against overwhelming odds, veterans, scientists, refugees, and believers unite to defend the last free human world while uncovering alien technology, new allies, and a war far larger than Earth itself.

Victory may save Mars-but it also reveals a terrifying truth.

Humanity is only the latest civilization to stand against the Nephilim, and the fate of countless worlds now rests in human hands.

Perfect for readers who enjoy military science fiction, first contact, space opera, and biblical epic fiction, Star Heir: The Nephilim blends cinematic battles, faith, and hard science into an interstellar war for the future of mankind.