Bobby "Bacala" Baccalieri Sr. comes out of retirement, which displeases his son and Uncle Junior; Carmela takes an active role in Tony's therapy.
As the team seeks justice for Carter's death, Finch fears one team member will go too far; the number of one of HR's key players comes up in the machine.
Attorney John Stone works to uncover information about the crime.
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.
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.