Join 13-year-old Jessie as she keeps a diary of her class's yearlong research project on superheroes, which culminates in the Superhero Slam: a head-to-head debate battle in front of the entire school. It's shy, comics-obsessed Jessie's dream come true . . . and worst nightmare. She decides to champion Batgirl, a regular person (albeit with major talent and training under her utility belt), and soon Jessie wonders what it would take to be Batgirl. Will she prove to her best friends, Cade and Audrey, that she's more than a sidekick? Can she take down archenemy Dylan at the Slam?

Combining science facts, lively illustrations, and comic-book trivia with actual correspondence from superhumans such as NYPD Sergeant Mike Bruen, Olympian Clara Hughes, and writer Kelly Sue DeConnick, is a celebration of the heroes among us and of one girl's super-secret identity: herself.