An ancient prophecy discovered in Scotland many years ago promises the complete destruction of humankind. Historian Mary-Jane Parsons and Professor Ramsey understand how to prevent the impending disaster, but they can’t do it alone. They need Nate Jamieson—Professor Ramsey’s former student—and his friend Ledger Burns. Both have known Mary-Jane for a long time: the three of them are bound together too firmly by a shared past.