Not all heroes wear spandex and capes. Sometimes, they come from the most unlikely of places. Heroes of Necessity collects four such tales of women who become the heroes that the situation calls for.

When a weather app starts talking to her, Molly realizes that her programming abilities can be used for far more good than she anticipated. After the zombies rise, Satchel finds out that not everyone with the zombies' speed shares their insatiable lust for brains. A night out drinking on Spring Break turns into a strange opportunity for Kirsteen. And in a city filled with heroes, Leila discovers that her power of amplification and suppression works a little differently than she expected when there's a volatile teenager with newly awakened powers in her house.