For the first time in Elementary history, we had a Gregson-centric episode. When a man tried to kill his wife, Cheryl, Sherlock and Joan did everything in their power to find the person responsible.
The twist in Elementary Season 2 Episode 6 was that the killer wasn't actually after Cheryl Gregson, it was just the wrong house. No thanks to Google maps!
Unluckily for the culprit, Cheryl was packing and left him with quite the memory.