Poison Pen
- Episode aired Oct 17, 2013
- TV-14
- 44m
When dominatrix friend of Sherlock's finds her client dead, Sherlock determines that he had been poisoned.When dominatrix friend of Sherlock's finds her client dead, Sherlock determines that he had been poisoned.When dominatrix friend of Sherlock's finds her client dead, Sherlock determines that he had been poisoned.