It is a world
much like our own where, in 1908, a small comet impacted in the Tunguska
forest north of Siberia. An event fantastic in itself, though in the
world of Power Heroes it was also the harbinger of the Age of Metahumans.
In that world, "super powers" are real.
It's in that world
that Jesse Wells (a.k.a. Liberty: The American Girl) uses her powers
to uphold the good. You can learn more about it in the sections listed