In a massive bibliography of business and business law works, Robert Illig opines that:
Conservative law professor Stephen Bainbridge describes the origins and development of this field in The New Corporate Governance. Bainbridge, though a partisan law and economics scholar, is an unusually clear and well-organized writer. As a result, so long as you are able to judge the ideological overlay within the confines of your own prejudices, you will find this volume to be a thorough and understandable introduction to the field.
Personally, I don't think the book is politically conservative, although I freely concede that it is unabashedly rooted in the "law and economics" genre. But YMMV.