Dr. Rüdiger Götte invites the reader on a journey into the adventure land of ETFs, or Exchange Traded Funds, in his latest publication. As with any journey, it is essential to gather information about the land and its people beforehand. Dr. Götte first outlines the key models of financial market theory, such as portfolio theory, so that the reader understands the theoretical concepts—along with their strengths and weaknesses—that underpin ETFs. Upon arriving at the destination, in the ETF adventure land, one must first get oriented—where is what? The reader quickly realizes that ETFs are exchange-traded funds that often aim to replicate the performance of an index, and thus are as good or as bad as the underlying index. Due to the particular importance of indices, Dr. Götte also explains all relevant aspects related to them in passing.