From the reviews:
"This book contains new results, e.g., new formulas for special values of certain Dirichlet series. Shimuras exposition, shaped to his (celebrated and) distinctive viewpoint, serves as the ideal platform for the new material. by dint of the prestige of the author and the subject, it undoubtedly deserves a place in a college library. Summing Up: Recommended. Upper-division undergraduates through faculty." (D. V. Feldman, CHOICE, Vol. 45 (9), 2008)
"It will be of great interest for everybody who is interested in modular forms and/or L-series. the monograph will be accessible to graduate students and will quickly lead them to frontiers of current research. The book is written in the well-known masterly style of the author ." (Jurgen Elstrodt, Zentralblatt MATH, Vol. 1148, 2008)