When their four-year-old son Gabriel’s leukemia relapses, Richard and his wife are thrust back into the nightmare they thought they had escaped. Every heartbeat feels like a countdown as they beg for a miracle to keep their child alive.

Meanwhile, elsewhere in time, Bill — a young university student reeling from heartbreak — suddenly glimpses a future that shouldn’t be his to see. Horrified by the suffering that seems to await, he vows to defy it at all costs.

As both men confront what they most fear, their stories converge into a haunting clash of destiny, courage, and life-altering choices. Will the actions they take be enough to rewrite fate, or are some destinies impossible to escape?

Echoing the emotional depth of The Time Traveler’s Wife and the heart-wrenching choices in My Sister’s Keeper, this novel asks a timeless question: what would you do, if you knew?