Holmes and Watson investigate a murder that resembles a crime commited by a serial killer who is already incarcerated on Elementary. "A Burden of Blood" is the eighth episode of the show's fourth season.
Holmes: Why do you suppose you hate your job so much? Watson: I don't hate my job. Holmes: You have two alarm clocks. No one with two alarm clocks loves their job. Two alarm clocks mean it's a chore for you to get up in the morning.