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Dirk Gently is a fictional character created by Douglas Adams and featured in the books Dirk Gently's Holistic Detective Agency and The Long Dark Teatime of the Soul. Adams was working on a third Gently novel, The Salmon of Doubt, at the time of his death.
Dirk bills himself as a "holistic detective" who makes use of "the fundamental interconnectedness of all things" to solve the whole crime, and find the whole person. In fact he is a con man, and the "holistic detective" label is basically an excuse to run up large expense accounts and then claim that every item was, due to the fundamental interconnectedness of all things, actually a vital part of the investigation.