An unstoppable event threatens the world's population by attacking the most basic human instinct of all: survival. Elliot Moore is an ordinary man who is trying to save his family from a terrifying, invisible killer. As Elliot discovers the incredible possibility of what is happening, it becomes very clear that no one is safe.

"Best friends don't always have the best intentions. On a brisk fall night in a New York apartment, 35-year-old Billie West hears terrified screams. It's her lifelong best friend Cassie Barnwell, one floor above, and she's just realized her infant daughter has gone missing. Billie is shaken as she looks down into her own arms to see the baby, remembering - with a jolt of fear - that she is responsible for the kidnapping that has instantly shattered...