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I need your assistance in murdering (at least) five people. Well technically, they are already long dead - but in 1888, they were still alive and kicking. IOTL, the Hohenzollern family traditionally celebrated Christmas in the Schloss Charlottenburg, and of course Christmas 1888 in particular was quite uneventful.
The date of the PoD must be the 24 December 1888 (even though the death date of some of the persons might very well be a few days later), the place however is up for discussion - but it would likely have to be in/around/near Schloss Charlottenburg, as the Hohenzollern family was present there at the specified date.