Josie O’Malley does a lot to help out Mam after her father goes off to
fight the Nazis, but she wishes she could do more—like all those caped
heroes who now seem to have disappeared. If Josie can’t fly and control
weather like her idol, Zenobia, maybe she can put her math smarts to use
cracking puzzles for the government. After an official tosses
out her puzzler test because she’s a girl, it soon becomes clear that an
even more top-secret agency has its eye on Josie, along with two other
applicants: Akiko and Mae. The trio bonds over their shared love of
female superhero celebrities, from Hauntima to Zenobia to Hopscotch. But
during one extraordinary afternoon, they find themselves transformed
into the newest (and youngest!) superheroes in town. As the girls’
abilities slowly begin to emerge, they learn that their skills will be
crucial in thwarting a shapeshifting henchman of Hitler, and, just
maybe, in solving an even larger mystery about the superheroes who’ve
recently gone missing.