A brilliant girl puzzler discovers she’s part of a superhero team! 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 Fantomah to Zenobia to the Black Cat. 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. Inspired by real-life women from World War II—the human computers and earliest programmers called “the ENIAC Six”.

A trio of young superheroes try to thwart a spy! After defeating The Hissler—and discovering their power as a team—The League of Secret Heroes are ready for their next adventure. When Akiko, Mae, and Josie learn that a spy is betraying secrets to the Japanese military, they join Room Twelve in San Francisco for important work with other code-cracking experts. But soon there is another very personal code to crack: Akiko is shocked to see her mom walking with the suspected spy, where Akiko’s family used to live. San Francisco had been their home until Executive Order No. 9066, which sent Akiko and all Japanese Americans on the West Coast into internment camps. Akiko fears her mother has become tangled up with something sinister, and soon, more evil forces are menacing the very camp where Akiko’s family is supposed to be. With the help of her fellow Secret Heroes, can Akiko solve the most important puzzle of all?

The League of Secret Heroes travel to Paris on their most critical mission yet in this third book in the action-packed, comics-inspired adventure series that’s Hidden Figures meets Wonder Woman ! When the Infinity Trinity hears of a Nazi spy plot that could bring danger to Chicago, Mae knows they must go to check on her beloved aunts, the daring World War II pilots Willa Brown and Janet Harmon. Mae’s Granny Crumpler isn’t exactly thrilled about her granddaughter and her friends trying to get involved with something so dangerous—especially when she’s already worried about not hearing from Mae’s dad, who is serving in Europe and fighting for freedom on and off the battlefield. But when Aunt Willa and Aunt Janet go missing, Mae knows that the sinister spy plot just got personal. They discover the evil Metallic Falcon has captured her aunts, and he is determined to thwart the Infinity Trinity’s ultimate quest to bring back Zenobia and all the missing superheroes safely. With the help of the Women Airforce Service Pilots (WASPs) and Room Twelve, Mae, Josie, and Akiko must use all their powers and code-cracking smarts in a challenge that will take them on a high-flying loop from Chicago to Sweetwater, Texas, to a final showdown in Paris. Can the Infinity Trinity soar to new heights and complete the biggest mission of them all?