Synopsis

A summons brings Sherlock back to London, to a case from years past. The return necessitates a confrontation with his brother, Mycroft. Their estrangement, born of a painful rift, had spanned several years. Yet, Mycroft offers Sherlock and Joan accommodation in his residence at 221B Baker Street. With Joan caught between them, the brothers are compelled to navigate the intricate and deeply troubled landscape of their shared history.