Katerina Sergatskova, *Goodbye, ISIS: What Remains is Future*. Kate Tsurkan, trans. Boston: Cherry Orchard Books, 2026.

What drove over 15,000 people from the former Soviet bloc to enlist in ISIS, making up nearly a third of the group's foreign fighters? In this insightful study, renowned journalist Katerina Sergatskova explores one of the most overlooked facets of global terrorism. Drawing on years of investigative journalism from Georgia, Turkey, Iraq, and Ukraine, she reveals the personal stories of ISIS recruits, their families, and even those falsely accused of ties to the organization. Through engaging interviews and groundbreaking reporting, Sergatskova highlights how post-Soviet fighters shaped ISIS, the group's growth into the Caucasus, and the unexpected role Ukraine has played as a sanctuary for some of its veterans. Alongside this narrative, she connects modern extremist networks to historical figures like Dzhokhar Dudayev and Shamil Basayev, illustrating how past conflicts have laid the groundwork for ISIS's reach. This examination is not only deeply human but also carries significant geopolitical weight, challenging common perceptions about terrorism, migration, and security in the post-Soviet context — underscoring the necessity of grasping these dynamics for global stability.