Holmes e Watson fizeram um acordo mutuamente favorável com Shinwell Johnson, um ex-condenado que oferece seu conhecimento do submundo da cidade em troca de aprender a ser um informante eficiente do FBI. A aliança do trio termina quando Shinwell agride Holmes depois que este e Watson descobrem que Shinwell cometeu um crime até então não esclarecido.

In season seven, Holmes and Watson’s new careers as consultants for Scotland Yard are disrupted by news that a member of their inner circle has been gravely wounded in the United States. As Holmes’ stateside legal trouble – the result of a confession to a murder he didn’t commit – threatens to keep them from returning to New York, their greatest foe to date, tech billionaire Odin Reichenbach, waits on the horizon to test their limits.