I was stunned by the success of Gone Girl by Gillian Flynn. It was obvious to me that the author was employing the unreliable narrator technique in the story. This came as a shock to many readers and viewers, which is odd when everyone tells you that there are at least two sides to every story. There is a long history of unreliable narrators in fiction. There is an even longer list in reality. They are called everyday people.
What is an unreliable narrator?
An unreliable narrator is a first-person narrator with a compromised viewpoint.
Read more via The Nine Types of Unreliable Narrator – Writers Write