Adventurers plops, ripe for the grabbing

You are a janitor, working at a rehab center for superheroes. You uncover a plot to poison all the heroes with a serum that will make them all fall into a permanent coma, and you must find out which of the therapists is the culprit before the world is doomed.

Fortunately, you have a superpower yourself. UNfortunately, you had trouble trying to make it useful when fighting crime that becoming a janitor was much smarter than becoming a full-time superhero. Your power? You can refill a bucket with water, using your mind to concentrate humidity in the air. It only works with buckets.