Every night at exactly 3:17 a.m., reality changes.
One morning, humanity awakens in a world where the Roman Empire never fell. The next, dinosaurs still rule vast regions of the planet. Other realities reveal gleaming cities centuries ahead of their time, frozen kingdoms, a united Earth-and worlds where humanity has already vanished.
Almost everyone instantly accepts each new history as if it has always been true. Only a scattered group known as the Unchanged remembers every version of Earth-and every person erased when reality shifts.
Dr. Elena Vázquez, a Puerto Rican neuroscientist, discovers that the changes are not natural. The memories bleeding between realities are distress signals from alternate Earths being consumed by the Hollow Choir: ancient interdimensional beings that exist inside moments of choice. They feed on abandoned possibilities, nest in human regret, and grow stronger whenever history is rewritten.
Elena remembers a husband who no longer knows her and a daughter who exists in only one erased timeline. As governments pursue the Unchanged and reality begins collapsing faster, she learns the terrifying truth: Earth has only seven possible futures remaining. When the final one is consumed, humanity will be erased from every reality-as though it never existed.
To stop the Hollow Choir, Elena must enter humanity's collective memory and locate the decision that first drew them to Earth. But destroying that moment could save billions while permanently erasing the people she loves.
Humanity has seven futures left. By morning, there will be six.
