Five friends leave their community and embark on an adventure that will change their lives forever in this fascinating utopian saga. Mori and her friends Julia, Benji, and Theo have never seen the world beyond the walls of their utopian community, Old Harmonie. That changes when their new friend Ilana is threatened by the rules that are supposed to keep them all safe. Together they escape, hoping to find help in Boston with Dr. Agatha Varden, one of Old Harmonie's pioneering founders. But as they encounter kids from the outside and face challenges they never expected, Mori and her friends begin to understand the complicated reality of their supposedly perfect world. With the help of these new friends, they just might be able to save Ilana, but at what cost? This thought-provoking sequel to Megan Frazer Blakemore's stunningly imaginative novel, The Firefly Code, gives readers a chance to see our world in a brand new light.