After The Avengers defeat Loki, he's shut away in an Asgardian cave prison. Until, one day his brother comes to visit and tried to recruit Loki to help him fight a new battle to save Earth and Asgard. Loki refuses...that is, until his brother reveals a little something that might change his mind-His son.

Mrs. Hudson is attacked. Sherlock is a suspect. As he sits in the cell, paralyzed with fear and regret, he remembers how Mrs. Hudson helped him through the horrors of his childhood. As he struggles through the agony of her injuries, Sherlock must reconcile a past that he couldn't have survived without the landlady who was more of a mother than his own.

Sherlock is expecting a visit from his mother. For the first time in a long time John finally sees his friend excited. That is until tragedy strikes and John must help Sherlock through a difficult time.