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.
On top of that, 
you've made a critical mistake.
.علاوة على ذلك، اقترفت خطأً فادحًا
Und außerdem hast du
einen großen Fehler begangen.
Además, cometiste un grave error.
Además, has cometido un grave error.
Mais surtout,
tu as commis une grossière erreur.
Per di più, hai commesso un errore fatale.
Além disso, você cometeu um erro crítico.
Кроме того, ты допустил одну
 очень серьёзную ошибку.