Though it raises complex philosophical and religious questions, Life of Pi's plot is almost ridiculously easy to summarize. We'll take you through the main events, but remember much of the novel happens through digression and in Pi's meditations sprinkled throughout the novel.
The book doesn't begin with Pi, but with an "Author's Note." We learn how the "author" (who shares some of Yann Martel's biography) found Pi's story. We should note one point of complexity: the author admits any mistakes in the narrative are due to him and not Pi, since he's presumably put together Pi's story from interviews, notes, and Pi's diary. What we read, then, in Part 1 and Part 2 is Pi's voice as the author has written it. And then, without further ado, we launch into Pi's story.