A terrorist bomber threatens Minneapolis during the run-up to the Aquatennial. None of the Post-Cogs can get a fix on him: whenever the bomber arrives, the timelines get corrupted. Cassie has other problems, too. No one will hire her because of how she came into her abilities. Her life of bliss with her girlfriend Sam has soured. She's even fighting with Chinaman Joe. When Cassie discovers that the bomber moves like Hunter, the vet who claims ghosts taught him, she'll have to invoke the Norse gods—as well as any others who are listening—to stop the madmen determined to raise the dreaded Old Ones and create Hell on earth.