The last page of the manuscript received by Poe appears to have been a photocopy. Rampo seems to know why, but there are still more mysteries surrounding the death of the author.
In the final chapter, the motive was 
described to be a personal grudge.
.في الفصل الأخير، تمّ وصف الدّافع على أنّه ضغينة شخصيّة
Im Lösungsteil des Manuskripts
war das Motiv Groll.
El manuscrito final dictaba
que el móvil era el rencor.
El manuscrito final dictaba
que el móvil era el rencor.
Dans le dernier chapitre,
le tueur devait avoir agi par rancune.
Nell'ultimo capitolo, il movente
è descritto come un rancore personale.
No capítulo final, o motivo foi
descrito como um rancor pessoal.
В романе мотивом стала личная неприязнь.