Reese and Finch try to unravel a threat to a promising young doctor (Linda Cardellini).
Detective Sherlock Holmes investigates a home invasion that led to murder.
Danny tries to find the source of a deadly narcotic after three teenagers die from an overdose.
Holmes and Watson join forces with Holmes' father to enlist his vast criminal network to help disassemble tech billionaire Odin Reichenbach's crime prevention system.
When Alicia goes head-to-head in the courtroom with former boss Jonas Stern, she debates whether or not to use personal information to her advantage. Meanwhile, Peter uses religion to work on his appeal.