Status Updates From Retorica della narrativa (A...

"Secret communion, collusion, and collaboration.
—All of the great uses of unreliable narration depend for their success on far more subtle effects than merely flattering the reader or making him work. Whenever an author conveys to his reader an unspoken point, he creates a sense of collusion against all those, whether in the story or out of it, who do not get that point."

Accessible. Booth uses examples from fiction I have actually read. Alas, mostly novels.