The Visit from Mrs. Black

When a strange doctor named Mrs. Black visits the home of Rodney Fairgraves and his sick wife in the midst of a plague, this doctor might have brought something more than her medicine to the house, endangering everyone in it.

P.S: This is for the March Sci Fi contest, and thank you all for the reads!

Sequel is on Part 2, where six people are transported to a habitable planet as humanity's last hope of survival. Mrs. Black is on this ship, and the crew will have their worst fears realized in this story of suspicion and terror as the one thing they try to escape has boarded their vessel.