The Mortal Contract follows Zarina and her immortal companion, Kivuli, as they leave the safety of their home island to explore the wonders and dangers of an industrially-evolving world. Their encounters with social unrest and political oppression lead them to question the nature of mortality and search for solutions to seemingly impossible dilemmas.

Across the ocean, Absinthia and her brother Talon emerge in the upper echelons of Morrigan, a predominantly human city in the Caledonian Empire. Guided by an unseen master, they navigate the complexities of political subterfuge- seducing allies and securing enemies -as they consolidate power to unleash an ancient entity.

Among these, Jonathan Corvax, a young Avestrian lawyer, fights to amend the racial disparities within Morrigan at the hands of corporate and political greed. While investigating the connections between Birch Enterprises and several key members of the Senate, a chance encounter with the beautiful and mysterious Theia leads him to discover the consequences of history and the influences of divinity.