Dickens knew that you would know exactly who killed Edwin Drood, and that doesn't matter, because the magician has already told you you're about to witness a trick, but you can't look away from the hand anyway, even as the other hand steals your watch and conceals the ace.
So forget that The Mystery of Edwin Drood isn't finished—deep down, you know what happens anyway—and remember that Dickens isn't there to found the long line of detective puzzles games, meant to snap together in an instant only when the reading is done, because Drood has already drawn you into a maze of illusions, and the reversal is that the thing you thought you had to figure out is not the mystery before you.
Perhaps no one is what they seem: the genteel choir-master is an opium addict, but that's just the first card. The confident young gentleman-protagonist is a victim, gone with all his flaws. The childish, pretty girl is sensible and compassionate. The staid boarding school mistress is a social butterfly. The dusty lawyer is a closet romantic (of course he was in love with Rosa's mother). The exotic orphans, brother and sister, will swap roles and identities. They're all masters of disguise, except the one person who really is in disguise, right Dick Datchery?
And Cloisterham, the staid, quiet, dusty cathedral town? Well, most of that dust is from monuments and corpses. Seen through Durdles' eyes, Cloisterham is a sepulcher, concealing death as much as the cathedral elevates solid English Christianity. And remote? Perhaps, but the toxic traces of empire are everywhere—tea, china, spices, exotic preserves, opium itself are products of imperial trade. The predictable, conventional racism that Jasper leverages to land suspicion on Neville Landless is itself just a thin cover, a pretext, to deflect from how deeply every part of of old England, the nostalgic version that Cloisterham would seem to celebrate, is compromised and transformed by (and complicit in) Victoria's sprawling empire, from Sri Lanka to Egypt.
Dickens never made it back to London and never finished the manuscript, but every time you go back to it, you're struck by how the structure of the murder is already there; it's the world itself that's a labyrinth of images, every character a mystery.
