Cal, Winter, Ryan and Boges have had enough adventures for a lifetime. Now all their enemies are locked up or have disappeared. Still, Winter can't shake the feeling that she is being watched. When she's mailed a note saying, The Drowner... 30 days, her worst fears are realized. Who could be after her and her friends this time? With Cal away at flight school and a dangerous mystery to solve, will Winter be able to survive the 30-day countdown? Or...

Cal Ormond travels to Ireland in search of the final clues to his father's death. He must reach the Ormond Singularity before the stroke of midnight. In the final days of this deadly 365-day countdown, it is clear that any second could be his last.