More than four decades have passed since surface-enhanced Raman scattering (SERS) was discovered. In today's world SERS has been established as a plasmon-based spectroscopy with ultra-high sensitivity and versatility at the forefront of the developments in plasmonics. SERS has been developing with the advances in nanoscience and nanotechnology. The "SERS world" has grown up markedly for the last 20 years or so, and recently the wider concept of, plasmon-enhanced spectroscopy was born. Plasmon-enhanced spectroscopy contains not only SERS but also tip-enhanced Raman scattering (TERS), surface-enhanced infrared absorption (SEIRA), surface-enhanced fluorescence (SEF), and more. Through these novel spectroscopies various amazing properties of plasmons have become known, providing new exciting research fields. One of the main purposes of the book is to convey the enthusiastic discussion on plasmon-enhanced spectroscopy at the symposium to the scientific community. This book reports leading-edge advances in the theory of plasmonic enhancement and application of plasmon-enhanced spectroscopy to biology, chemistry, physics, materials science, and medicine. Many books have been published about SERS, but this may be the first time that a book on a wide area of plasmon-enhanced spectroscopy has ever been published. The book consists of two volumes; the first volume contains the introductory review by George Schatz followed by eight chapters, which are mainly concerned with SERS.