Splitter commences this book by telling the reader that it was a pedagogical incident that led him to write it. Presenting a philosophical seminar series on the topic of ‘identity’ to bright undergraduate students in America from a range of disciplines heightened his realisation that we don’t all use the word in the same way to refer to the same thing. We wouldn’t normally think too much about it, assuming that identity, especially one’s own, is an obvious, assumed entity. However, it is not, really, the closer you examine the concept. Which is precisely what Splitter goes on to do.