Omega Night (Wearing the Cape Series)

Astra, Hope Corrigan, has survived to see nineteen and is trying to balance her superhero career with school and a whiff of a social life. But the world is bigger than Chicago, and with a handful of other capes, she finds herself on a mission to save America from a supervillain's doomsday weapon.
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Omega Night (Wearing the Cape) is a 5,000-word short story taking place between the events of Villains Inc. and Young Sentinels.