Nikhil Ranjan Sen (NRS) is, to some extent, an unsung hero of modern Indian mathematics. In spite of his pioneering work in various branches of Applied Mathematics and pure physics, this person did not receive due recognition in his lifetime and has remained largely obscured in common parlance. It is unfortunate that except publication of some articles on him, none came forward to write an authentic biography of NRS covering his life and scientific contributions. At last, the recently published book N. R. Sen: Life and Science by Dr. Rajinder Singh of Oldenberg University, Germany and Suprakash C. Roy, Retired Professor as well as Editor-in-Chief of Science and Culture, will fulfill that long felt need. Both Dr. Singh and Prof. Roy are experienced researchers in History of Science and they have several publications, both single and joint. In the book under review, they have unearthed a number of new information about NRS using primary sources. Apart from Introduction, the book contains eight chapters and an Appendix. Of these, six chapters are devoted to discussion of scientific contributions of NRS and his associates.