Don't tell anyone what this book contains. So? Are you curious now? Few things are more enticing than the prospect of being in on a secret. Whether it's banking confidentiality, doctor-patient privilege, or a suspicious text message - we are surrounded by secrets. But what exactly is a secret? How can we keep it, and why do we often fail to do so? Thorsten Havener, as a magician, is an expert on the mysterious. He explains how secrets shape us, how they can weigh us down or make our lives more exciting, and how their revelation can either free us or get us into trouble. Last but not least, he compellingly illustrates why we need secrets - especially in the age of Big Data, Facebook, and the like.