Many writers use the unreliable first-person narrator.
Their story is told from a single viewpoint and you can’t be sure if the narrator’s interpretation of events is accurate.
That was an important development in modern literature, but with Black Bottle Man I wanted my readers to be my allies in this story.
The only way for that to happen is for them to implicitly trust that they are being told the truth.
When a story is told by a variety of characters and all their versions match, the level of trust between reader and writer grows and the reader can lower his guard, connecting on a more emotional level.