An unforgettable epic romantic thriller about a girl from the future who might be able to save the world . . . if she lets go of the one thing shes found to hold on to. Follow the rules. Remember what happened. Never fall in love. This is the story of seventeen-year-old Prenna James, who immigrated to New York when she was twelve. Except Prenna didnt come from a different country. She came from a different timea future where a mosquito-borne illness has mutated into a pandemic, killing millions and leaving the world in ruins. Prenna and the others who escaped to the present day must follow a strict set of rules: never reveal where theyre from, never interfere with history, and never, ever be intimate with anyone outside their community. Prenna does as shes told, believing she can help prevent the plague that will one day ravage the earth. But everything changes when Prenna falls for Ethan Jarves.