  This book is highly recommended as a starting point. It starts from ground zero, developing the mathematical tools needed to understand quantum mechanics. It is well written, and friendlier than Griffiths for students who are learning the subject on their own. QM is not introduced until page 115.  The introductory chapter on linear algebra is very good. At 676 pages, it is comprehensive. It covers Feynman path integrals more thoroughly than other books, and contains solved problems. If you buy one book on QM, this is a good choice.  