It's the end of the line. In the third and final novel of the bestselling Agora Virus series, Frank and the survivors are about to face one final, deadly test. Will anyone survive? Months after tackling a local threat, the strain of the collapse is weighing heavily on everyone. As Kate embarks on a treacherous journey back to the island from Atlanta, Frank, struggles to hold the group together. But that's the least of his troubles. Someone is watching, waiting and picking off the survivors one by one. No one is safe. Surrounded by danger and pushed into a corner, Frank and Sal will have to face this terrifying threat head-on if any of them hope to survive.