I wholeheartedly agree with StevenDvd's review - if you are a complete beginner, and have nobody who is familiar with Hindustani (North Indian) Classical Music to teach you, then this book is a good, but very basic and modest introduction to playing sitar.
A move 'up' - and one which will keep the beginner busy for a long time, is the 'sitar manual' part of Pandit Ravi Shankar's book 'My Music, My Life'.
In my opinion, a good complement to Panditji's book is Ustad Ali Akbar Khan's 'Classical Music of North India the First Years of Study: The Music of the Baba Allauddin Gharana As Taught by Ali Akbar Khan at the Ali Akbar College of Music'. This book, edited by George Ruckert, provides a very thorough, and easy to understand explanation, history, and contextualization of the complicated subject of North Indian Classical music, in addition to providing musical instruction (the musical instruction in this book is of a 'general' nature, from a vocal music perspective, rather than discussing any particular instrument).
I would advise neophytes to stay clear of Manfred Junius's 'The Sitar The Instrument and Its Technique',unless they are looking for detailed advice on how to do jawari for the sitar, as this book provides little to no musical instruction.
S. Bandyopadhyaya's 'Techniques of sitar: The prince among all musical instruments of India', is an exhaustive, quite complicated treatise on sitar playing which is devoid of much of the context that those new to Hindustani Classical Music in general, and sitar playing in particular would probably need to understand the context for many of the lessons and discussions therein.
Those who are new to Indian Classical Music could learn a lot from the forms on the website run by David Courtney (co-author Of 'Mel Bay Presents Learning the Sitar'), and his wife Chandrakantha, which can be found at [...] (this is just the beginners part of this website, and there are other parts designed to cater to those who are more experienced).