When a not-so clever pick-pocket is found dead in a holding cell, Watson discovers that he has anthrax poisoning.
On Elementary Season 2 Episode 20, the anthrax scare sweeps New York City, though Sherlock is more pre-occupied with the death of his dear friend Alistar..
As Holmes tries to cope with Alistar's passing, he finds himself at a loss while two brothers try to save their dwindling farm.
Sherlock and Joan close in on the missing anthrax while the plot to kill a herd of cows relates directly to the case at hand. See it all unravel when you watch Elementary online.