In the world of the Inside Us, life is sustained by energy. Every human carries a heart’s soul bound to a fragile container, strengthened or drained by every connection they form. When that container empties, life ends.
Eva, heir to the first of five kingdoms, is a Source, a rare ruler capable of forging powerful energy bonds. Yet power has never made her fearless. Thoughtful and deeply self-doubting, she struggles to control the force she was born to command.
Centuries after its defeat, the forbidden Sixth Kingdom rises again. Its followers believe that the flaw of humanity lies within the very system of the heart’s soul. They seek to sever it entirely and unite all energy into a single controlled vessel, erasing the chaos of human life experience in the name of stability and order.
Among them stands Eva’s own twin brother.
As her energy spirals toward collapse, her Protector, a being whose existence is bound to her heart’s soul, makes a desperate choice to save her. But survival is not enough.
To stop the Sixth Kingdom, Eva must learn to master her container and confront the fear that has always defined her. Because what the Sixth Kingdom calls weakness, she knows to be something else entirely.
The richness of human life, in all its beauty and suffering, is not a flaw.
And she was born to prove it.