Kirzner wrote no general treatise on economics. Instead, his writings tend to be topical. His most well-known work, for example, is on entrepreneurship. So, unless you have an deeper interest in the topics he addresses, Kirzner isn’t the best source for being introduced to Austrian economics.
Joe Salerno discusses Kirzner in the context of the Austrian school:
http://mises.org/journals/qjae/pdf/qjae5_4_8.pdf
