Crypt of the Flower Moth

Publisher's blurb:

The insane asylum’s crypt was used to hold some of the bodies of patients while doctors decided what to do with them. By the looks of it, you’d guess that perhaps the crypt was already here and the asylum built around it to use it as a makeshift morgue. The bodies have been down here a long time and strange flowers and mushrooms are growing out of some of them . . . like a macabre bouquet. However, there is something even stranger going on. Something . . . alive . . . appears to be living inside the dead bodies, crawling around in their skin. When you see a very large moth crawl out of one of the corpse’s mouth, you know you need to get out of here quickly.