who killed that fat courier in the Cleo?

like i said before, cassie and leo are not aware, that they are being hunted, by karch, in the dark, and like i said before, i don't know who killed that fat courier in the Cleo, i mean, i knew, but, i don't know, since last time, when i read this one, years ago, now, this is, exactly, the joy of detective thrillers, since, you'll remember, nothing, at all, after you put it down