Thornback Hollow is under quarantine. Its people cannot sleep — afflicted by a disease called the Waking Death that spreads outward even as soldiers under Baron Osbert Morlond seal the gates on behalf of the Crown. You are one of the plague doctors legally required to respond. Mask of the Plague Doctor is a 409,000-word interactive novel in which you navigate the town's sickness, its political tensions, and the whispered rumors of a darker power buried in the outbreak — determining whether cure or escape is even possible, and what you are willing to do to find out.