The correspondence between Sophie Dorothea and Königsmarck is very voluminous. The greater part of it (six hundred and seventy-nine sheets, one hundred and ninety-nine from the Princess and four hundred and eighty from Königsmarck) is preserved in the university library of Lund. The letters at Berlin number sixty-five sheets, fifteen from the Princess and fifty from Königsmarck. It is certain that the letters at Berlin and those at Lund spring from the same source, the exact similarity of the writing, the use of the same cypher and the same nicknames, the identity of sentiment and style, and the fact that some of the Berlin letters seem to be answers to some of those at Lund and _vice versa_, prove this beyond doubt. Clearly they stand or fall together. Applying to the Berlin letters the same tests as applied to those at Lund, they yield absolutely the same results. The Berlin letters afford little historical interest outside the politics of the petty courts of Hanover and Celle. Like those at Lund they are alternately full of jealous reproaches and passionate avowals of love. They shed no fresh light on the events immediately preceding the catastrophe of July 1, 1694, for they appear to be written prior to the visit Königsmarck made to Dresden before he returned to Hanover for the last time. Letters must have passed between the lovers in the months preceding the tragedy, and these are still needed to make the correspondence complete. But they are not at Berlin, they are not at Lund, they are not at Hanover. The question remains, Where are they?