The last book I read by Sophie Masson was The Madman of Venice (for which, q.v.). Indeed, I once taught it in a course I developed called "Modern Shakespearean Fiction."
I ran across this one in an essay for the most recent Shakespeare Association of America Convention. From the title, I thought it might be a sequel to Twelfth Night, and it does have some elements of that, but it's more of a mirror novel, but with a twist.
The story involves a touring troupe of actors putting on a play entitled Malvolio's Revenge. They end up in New Orleans. The year is 1910. There's much witchcraft, mystery, and intrigue.
Because of the mystery and intrigue, I don't want to say too much about the plot—spoilers, you know. But I'll provide a few sample pages—particularly geared toward the plot of the play-within-the-novel.
The first gives us the troupe's first sight of a Louisiana manor house called . . . yes, you can probably guess it . . . Illyria:
Later, we learn a bit more about the play:
I thought the book had a good sense of setting and tone, and the plot is intriguing. We don't get as much of the play-within-the-novel as I'd like—I'd like to learn more of the vision of the afterlife of Twelfth Night that the novel plays with.