Sold in a fierce US bidding war, The Interstellar Sisterhood of Moonie and Junie is the first book in a series about two very different girls who become tried and true best friends. Vibrant, unique, and laugh-out-loud funny, Katie Kordesh’s graphic novel debut is The First Cat in Space Ate Pizza meets The Babysitters Club graphic novels.

THE INTERSTELLAR SISTERHOOD OF MOONIE AND JUNIE
by Katie Kordesh
HarperAlley, Summer 2026
(via Writers House)

Welcome to the Moon! We’re so glad you’re here. . . but I have some bad news.

The moon is boring.

Don’t believe me? Ask Moonie. She lives on the Moon all alone with not a friend in sight (unless you count her rock collection: Daisy, Raul, George, and Stinky). Flares and an S.O.S. message in the dirt haven’t brought anyone new to the moon, so a desperate Moonette launches a letter in a bottle out into the vastness of space. . .

. . . and that bottle floats perfectly to the porthole of a rocket. In that rocket is Juniper Lee Holmes, Junior Space Explorer and Field Scientist (and alien), who is on an intergalactic space expedition— otherwise known as a “family vacation”—with her parents. She has logged many findings about this strange solar system but knows nothing about the Moon.

They are perfect pen pals; Juniper is proof of other intelligent life in the universe, and Moonie can provide scientific data about the Moon for Junie’s Field Guide for Intergalactic Space Explorers. Everything is going STELLAR. That is, until letters and walkie-talkies no longer suffice. Moonie wants Junie to venture to the Moon so they can explore moon caves, make dirt angels, and go crater sledding together. But Junie has a long list of fears, including heights, open bodies of water. . . and in-person communication.

Will Moonie be able to lure Junie to visit the moon? Will Junie’s fears prevent them from meeting and curing Moonie’s loneliness? Have you ever seen an extra-terrestrial duck? A glorburger? An alien with social anxiety? Find your answers (and possibly a Moon Princess) in The Interstellar Sisterhood of Moonie and Junie!

Katie Kordesh is the artist of Sam with Ants in his Pants and the author-illustrator of Enola’s Best Friend and the forthcoming Merpig. An Indiana native, Katie is based in L.A. She was previously the social media illustrator for the N.F.L. She also has an Emmy. The Interstellar Sisterhood of Moonie and Junie is her graphic novel debut.