“So full of verve and imagination that the sinister steampunk world practically pops off the page. The prose sparkles, the inventions astonish, and the characters are ones you'll root for from the moment you meet them. Loved it, beginning to end.”

– Stefan Bachman, author of The Peculiar

"In this steampunk fantasy...no one character is all good or all bad, and Trevayne explores their motivations and machinations thoroughly. The richly drawn world and inventive steampunk elements help this novel stand out from the pack of middle-grade fantasy."

– School Library Journal

"[F]ast-paced, escalating suspense...the novel’s strength lies in worldbuilding and vivid descriptions, and Anglophiles will likely enjoy the historical-cultural references."

– Kirkus Reviews

"Once action passes through to Londinium the pace picks up and the steampunk narrative starts to hum. Jack's mechanical ability is put to good use, but it is the power of loyalty and friendship that gives the story its strength and drives it to a rousing conclusion."

– The Horn Book Magazine