What is alecto the ninth?

Alecto the Ninth is the second book in the "Locked Tomb" trilogy written by Tamsyn Muir. It is a science fiction/fantasy novel that follows the character of Harrowhark Nonagesimus, a necromancer who is forced to compete in a deadly game to become a Lyctor, a powerful immortal servant to the Emperor. The book is known for its unique blend of genres, intricate world-building, and complex characters. It was published in 2020 and received critical acclaim, with many praising Muir's writing style and storytelling abilities. The third and final book in the trilogy, titled "The Last Emperox," was released in 2020.