The Book of Esther is accepted by all Christian traditions, but with significant differences in content. Protestant Bibles follow the Hebrew Masoretic text (10 chapters). Catholic Bibles include six additions (chapters 11-16), known as 'The Rest of Esther,' based on the Greek Septuagint version. This 16-chapter enumeration comes from Jerome's Latin Vulgate translation, where he first translated the Hebrew text (chapters 1-10) and then added the Greek fragments as an appendix (chapters 11-16). The Ethiopian canon follows the Septuagint tradition, thus includes the additions in the same manner as the Catholic tradition.
Esther
Chapter 12 — Mordecai Discovers the Conspiracy
And he abode at that time in the king's court with Bagatha and Thara the king's eunuchs, who were porters of the palace.
And when he understood their designs, and had diligently searched into their projects, he learned that they went about to lay violent hands on king Artaxerxes, and he told the king thereof.
Then the king had them both examined, and after they had confessed, commanded them to be put to death.
But the king made a record of what was done: and Mardochai also committed the memory of the thing to writing.
And the king commanded him, to abide in the court of the palace, and gave him presents for the information.
But Aman the son of Amadathi the Bugite was in great honour with the king, and sought to hurt Mardochai and his people, because of the two eunuchs of the king who were put to death.