Helen is a fictional character portrayed by Siobhan Hewlett in the TV series Sherlock.
They appear in 1 episodes out of a total of 12 aired
Episodes1
A Study in Pink
episode S1.E1 october 2010War vet Dr. John Watson returns to London in need of a place to stay. He meets Sherlock Holmes, a consulting detective, and the two soon find themselves digging into a string of serial "suicides."