Tory Brennan is the leader of a band of teenage 'sci-philes' who live on an island off the coast of South Carolina and when the group rescues a dog caged for medical testing, they are exposed to an experimental strain of canine parvovirus that changes their lives forever.

"From the #1 New York Times bestselling author of Small Great Things and The Book of Two Ways comes a deeply moving novel about the resilience of the human spirit in a moment of crisis. Diana O'Toole is perfectly on track. She will be married by thirty, done having kids by thirty-five, and move out to the New York City suburbs, all while climbing the professional ladder in the cutthroat art auction world. She's an associate specialist at Sotheby's...

When a renowned expert in infectious diseases disappears without a trace, Letty Davenport, with the world on high alert, calls in her father, Lucas, to locate him, and when their worst fears are confirmed, they must race against time to stop the virus he created from becoming the perfect weapon.