A women steps into a bloody puddle and finds a severed hand. Sherlock believes the body was dragged under a car when it was impounded. The victim, Moshe, owned Postal Unlimited where Sherlock finds a hidden safe. Gregson is in trouble for punching a fellow police officer, although he refuses to say why he did it. After reviewing Moshe's books, Sherlock realizes he was smuggling diamonds. After they find a briefcase with bloodly handcuffs, Sherlock believes his hand was pulled off, not severed. A strong weightlifter could do it, so they go to a nearby gym. Sherlock hones in on a suspect and challenges him to arm wrestle. But instead of arm wrestling, Sherlock hits him in the nose. He wanted a DNA sample. It comes back a match, and the weightlifter, Dana, confesses to the murder and provdes the names of the other people he was hired to kill. Gregson's daughter is upset that he hit her partner. Gregson is upset because her partner/boyfriend had become abusive. She wants her dad to make amends her partner, which he doesn't want to do. Will Sherlock and Kitty find a connection between the names on the hit list? Will Gregson shake the hand of the man who hit his daughter? Watch Elementary Online via TV Fanatic to find out the answers.