Expired at seventeen and living in a middle world for those who died young, Walker Callaghan and her rebellious love, Daniel Reid, have been tasked with an insurmountable mission: Find something hidden in the past that will forever change everything for the living and the dead. Sent to a place where a second can mean a lifetime, Walker and Daniel find their existence threatened as they scour New York City decades to find the lost, secret writings of Albert Einstein.

They are warned, "Die in the past and you will never be born in the future."History has a way of being rewritten by those who defy the odds. In the third book of the Ascenders Saga, will Walker manage to survive or delete her own story?