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Dennis Nilsen seemed unremarkable – a quiet civil servant in North London. But behind the closed doors of his Muswell Hill flat, he harboured one of the darkest secrets in British criminal history. Over five years, he murdered at least 15 young men, driven not by rage, but by a desperate need for control – and for company. Inside the Mind of Dennis Nilsen goes beyond the horror of Nilsen’s crimes to uncover the complex psychological forces that shaped them. Through forensic analysis, behavioural profiling and insights from criminologists the book examines this killer’s fractured psyche and reveals how loneliness, repression and identity struggles turned man into monster. Chilling, thought-provoking and deeply human, this is not just a story of murder – it’s a study of what happens when the mind turns inward and festers in the dark.