Beneath Ceaseless Skies - Spider’s Ink by Jason S. Ridler
To catch a bug, you must burn him out. That had been our experience with Macti spies and rebels. Under the authority of the Wayfaring House we came with black fire and warned all that if the Spider known as Heriz was not returned, we would decree the island corrupted and purify by shot and flame. It had worked in Jani, Uurun, and it would work here.