Bobby 'Bacala' Baccilieri Sr. comes out of retirement to deal with a young hothead named Mustang Sally--much to the chagrin of his son and Uncle Junior.
The team investigates a bus full of dead commuters who appear to be fossilized, and uncover a man who has visions of pattern-related disturbances before they happen; Dr. Bishop requests a piano in the lab to help him process data.
Sherlock helps investigate a double murder that has similarities to a series of homicides that took place 13 years ago; Watson tries to learn more about the mysterious man in her care.
Elizabeth tries to find funding for an electrical grid in a Syrian refugee camp during an impending government shutdown.
Attorney John Stone works to uncover information about the crime.