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“Hannigan takes on history, prejudice, friendship, and bravery with aplomb. Fans of fast-paced action adventures, computer science, and confident main characters will enjoy this series debut that is
sure to fly off the shelves.”

—School Library Journal”

Hidden Figures meets Wonder Woman in this action-packed, comic-inspired adventure about a brilliant girl puzzler who 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, and 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 remarkable real-life women from WWII — the human computers and earliest programmers called "the ENIAC Six" — this pulse-pounding adventure features bold action, brave thinking, and an empowering belief that each one of us has the stuff it takes to be a superhero.


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Cape: book 1


the detective's assistant

Set in Chicago just before the Civil War, The Detective's Assistant (Little, Brown Books for Young Readers) is based on a real American heroine: the nation's first female detective, Kate Warne. Along with her niece, Nell, they set off on hair-raising adventures solving crimes and thwarting danger.

"In these witty and well-researched pages, Kate Hannigan has found just the right blend of fact and fiction, history and mystery." 
— Richard Peck, Newbery Award-winning author of A Year Down Yonder


"Who doesn’t need Nell Warne in their life? Meet a cipher-solver, a master of disguise, and someone who’ll make sure you get the best 'day old' meat from the butcher. Ah Nell Warne — ever optimistic in the face of difficulty — I’m delighted to make your acquaintance!" 

— Newbery Honor winner Amy Timberlake, One Came Home

"A delightful, warm-hearted adventure. Kate Hannigan brings an important chapter of history to life for young readers."
— Daniel Stashower, author of The Hour of Peril: The Secret Plot to Murder Lincoln Before the Civil War


 ". . . a great title for promoting women's history."
— Booklist ★ starred review 


". . .  this is one for the ages."

— The Bulletin of the Center for Children's Books ★ starred review 

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Cupcake Cousins

Cousins Willow and Delia have seen those flower-girl dresses for their aunt's upcoming wedding, and they say "no way"! But how will they get out of having to wear them? 

Confident in their kitchen skills, Willow and Delia decide to bake their way out of every jam — to disastrous, hilarious results.


Picture books

A Lady has the floor

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Are women not worth the same as men? Belva Lockwood spent her whole life asking that question.


She had big dreams and didn't let anyone stand in her way — not her father, her law school, or even the U.S. Supreme Court. She fought for equality for women in the classroom, in the courtroom, and in politics. In her quest for fairness and parity, Lockwood ran for President of the United States, becoming the first woman on the ballot. 

Belva began in the classroom, giving her female students the same opportunities as the boys for speaking up before the whole school. She changed laws to bring equality to the classrooms across New York, and she didn't stop there. Moving to Washington, D.C., Belva fought for a woman's right to speak up in courtrooms. In 1884, she ran for president even though women would not secure the right to vote for another 36 years. She was the first woman on the ballot, first before the Supreme Court, and first to pedal around the nation's capitol on a bicycle. Belva Lockwood was truly a woman ahead of her time.

“An excellent example of picture-book biography.”
— Booklist ★ starred review

"Hannigan presents an invigorating account ... " 
— Publisher's Weekly ★ starred review

“. . . will inspire children to do whatever they desire in life, no matter what immediate restrictions exist.” 
— Kirkus ★ starred review 

Send an email to



contact Kate's agent,

Jennifer Mattson,

at Andrea Brown Literary 

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