Legion (novel)

"Legion" is a science fiction novel by William Peter Blatty that explores themes of identity, consciousness, and mental illness. It centers on Eddie Dean, a man with multiple personalities and a mysterious presence known as Legion, which manifests as a series of alternate identities within him. As he seeks to understand his inner world, he encounters supernatural elements and moral dilemmas. The novel blends psychological thriller with supernatural horror, examining how fragmented identities can reveal deeper truths about human nature and the nature of good and evil.