Body count: 4.
Much of this game takes place at Sherringford Hall. Sherringford Hope (or Holmes) and Ormond Sacker were Sir Arthur Conan Doyle's original name choices for Sherlock Holmes and Dr. John (or James) Watson.
The end credits note that the game was based on a novel by Jalil Amr. This doesn't refer to a published novel, but to something along the lines of fan-fiction.
Frogwares' first Sherlock Holmes game to be presented entirely in third person perspective rather than first person perspective in the other games.