At age ten he is a disappointment to his brother, more interested in dead things than deductions. When a small, strange girl moves to the village, Mycroft gets a protégé, but Sherlock finds something much more.

[Post-Reichenbach] In which Molly Hooper finds a new job, fakes a death, copes with the fallout from said death, is institutionalized, falls in love, publishes some papers, and finds the courage be herself. Not necessarily in that order.