What if Homo sapiens were not the only human species to survive?

In this world, Homo sapiens and Homo neanderthalensis evolved side by side, developing rival civilizations with their own cultures, religions, technologies, and ways of life.

For two centuries, the Sep and Thal civilizations have been locked in war.

In the magnificent capital of Araya, Priestess Charvi struggles to protect her people as the Thals develop a secret weapon powerful enough to change the balance of the war.

As both sides race to develop new weapons, the conflict spreads across seas, skies, and borders.

But the war is not only being fought on battlefields.

Saiman, a Homo sapiens spy living inside the Thal civilization, is caught between two worlds as suspicion begins closing in around him.

Meanwhile, Majid awakens to discover that the memories he thought were dreams may be real—and that someone has gone to extraordinary lengths to make him question reality itself.

The Four Bloodlines: Act 1 — The Silent Front is a science-fiction story of speculative human evolution, rival civilizations, espionage, military technology, and war.