Vivienne already stopped an apocalypse scenario, so shouldn't that have fulfilled her hero quota?
Evidently not.
One threat has been quashed, but Natalie's visions maintain that the worst is yet to come. Considering Vivienne died last time, she's not looking forward to more eldritch gods. Against her stands unknowable abominations and those stupid enough to make deals with them. Too bad that includes the strongest and most well-connected witch around.
In her corner, she has two psychic best friends, a spellwriter who may hate her (though his demon doesn't), a messy attempt at a luck spirit, her new apprentice, and her own stubbornness.
Together, they'll stop an(other) apocalypse. Somehow.