Poison Pen

The story unfolds in a rather plain procedural way, with leads appearing and dissolving as required to keep up the interest of the viewer. What is really interesting is that more and more facets of Sherlock's troubled personality are emerging, especially his penchant to explore unconventional romantic relationships as early as his puberty.

There are more reasons to consider this an above average installment of the series, like Detective Bell immediately commenting about Joan's behaving and sounding more and more like her mentor, in a clear acknowledgment of her observation skills, adding maybe a subtle note of jealousy.

Definitely worth watching.