You are replacing a doctor, charged to find who, among the three patients, is the one that is contaminated. To do this, you can use a whole range of experiments to be performed on the sick. You can also ask the guard to do the dirty work for you.
Honestly I walked away from my pc whilst this was on because I got frustrated with how simple and boring the title was, there's no real story, the game consists of just 5 simple rooms that feels like it couldve been cobbled together in GMod and it's all over before anything really starts, glad I got this on sale for 77p