Tess and Leo find themselves trapped inside a chemical plant when an active shooter targets the facility's manager. While trying to evacuate workers, Tess must navigate the highly dangerous, flammable environment with Sunny's remote guidance. As they race against time, Tess works to outsmart the gunman to save Leo and prevent a deadly explosion, while Matt and Mia step in to provide critical assistance. Meanwhile, Tess and Sunny are each hit with unsettling personal news.