This mystery takes place in a large chemical manufacturing plant. John, the plant manager, ruled this old empire and knew every square foot of the sprawling industrial site. He worked his way up from operator to supervisor, and finally to plant manager, where his word is law. Although he was fair and honest, most found him hard to deal with.

This chemical plant had thousands of values, switches and dials. While John understood how every product was made, the operators and their supervisors knew what they were doing and felt insulted by his constant meddling. While they disliked his management style, no one would confront him. Emotions were building to a point where something was going to will blow.