"While the conspiracies and plots unfold in classic spy-story fashion, the wildly inventive setting gives the novel a unique kind of freshness." ― Chicago Tribune
"Wildly imaginative . . . the world building here is exquisite . . . it should appeal equally to readers of fantasy and to those who enjoy alternate-history fiction set during the WWII years." — Booklist
"A jaw-dropping, knowing, hyperintelligent yarn." ― Kirkus Reviews
"[Rajaniemi] smoothly transitions to this magical dieselpunk tale (airships battle 'ectoflyers' in soul-powered flight suits) with all his technical skill in evidence." ― Publishers Weekly