"Halcyon is an entertaining thought experiment, and Ackerman writes with a gentle, graceful style . . . Ackerman delivers a potent critique of the what-if nature of talking about history . . . Ackerman, as much as any working novelist today, is invested in getting the facts of war and history right." --Mark Athitakis, Washington Post

"A blend of counterfactual history and futurism and a way to think about some of our thorniest social and cultural issues today." --Jeffery Gedmin, American Purpose

"Frightening, funny, and thought-provoking." --Mark Braude, The Octavian Report

"Ingenious . . . Elliot Ackerman prefers challenging questions over convenient answers, leaving ample room for readers to engage in leaps of imagination as bold as the ones he's undertaken . . . Blending alternative history with science fiction, Ackerman artfully explores several provocative issues that have become flash points in contemporary America." --Bookpage

"Thought-provoking . . . Visionary." --Publishers Weekly

"A novel of ideas in an age of opinions." --Kirkus Reviews

"A thoughtful and fascinating thought experiment, one that explores mortality, fate, and the malleability of historical memory." --Booklist