In this revised edition of The Secret Connexion, Galen Strawson explores one of the most discussed subjects in philosophy: David Hume's work on causation. He argues that Hume believes in causal influence, but insists that we cannot know its nature. The regularity theory of causation is indefensible, and Hume never adopted it in any case. His style is lively, even impassioned. Best of all, he shares the reader's amusement at his own fevered combing of the text.