Sisters in Arms tells the story of Grace Steele and Eliza Jones, two African American women who join the Women's Army Auxiliary Corps and who are among the first African American women allowed to serve in the United States Army. As the 6888th Central Postal Directory Battalion forms, Steele and Jones find themselves in wartorn Europe serving their country despite the dangerous that lie ahead. This story is based on the true story of the 6888th Postal Battalion, the only all-Black, female Battalion in the United States army that served overseas.

Kaia Alderson is a romantic comedy and historical romance author who has been featured on Bustle and Book Riot. She graduated from Spelman College and the University of West Georgia. Sisters in Arms was a July 2021 Book of the Month Club pick, a September 2021 Wall Street Journal Book Club pick, and a November 2021 Literati/Stephen Curry’s Underrated Book Club pick.