Black Butler: Book of Murder -OVA- Season Four [Blu-ray + DVD]

At the Queen's request, Ciel and the demon butler Sebastian host an extravagant dinner party for the who's who of the London underground. But an evening that begins with the promise of unmatched elegance quickly spirals into mayhem when their most distinguished guest is found murdered in his room. Now, trapped in the Phantomhive Manor by a dark and stormy night, Ciel and Sebastian must work together with their high-class guests, including the legendary author Sir Arthur Conan Doyle, to find the murderer in their midst before the blame falls on the host and his somewhat suspicious staff. Save the date and don't be late, the real party is about to begin.