A mad bomber terroizes Minneapolis during the week of the Aquatennial. None of the post-cogs can get a fix on him: wherever the bomber goes, the timelines get corrupted. Cassie has problems of her own. No one will hire her because of how she came into her pre-cognative abilities. Her life of bliss with her girlfriend Sam has soured. She's even fighting with Chinaman Joe. Then Cassie discovers that the bomber moves like Hunter, the vet who claims ghosts taught him. Cassie will 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 bring Hell to earth.