Who killed Sherlock Holmes?

As a fictional character remembered by the people of London, Sherlock Holmes' ghost walked the city, but now someone has put a ceremonial dagger through his chest. What could be the motive? The small team of Metropolitan Police detectives who have 'the sight' find themselves pursuing a criminal genius who soon lures them into a Sherlockian maze of too many clues and too much evidence. Ross finds herself drawn to an actor who may or may not be a deity, and goes on a quest to win back her happiness. Lofthouse seeks the answers, finally, about why she brought the team together. Quill battles for his sanity and Costain for his soul. And Sefton just wants to bring his team back together, even if that takes him to the edge of death.