In this third edition of The Problem With Interest, evidence arising from the recent financial crisis has been included to support the main themes of the 1997 and 2003 editions. The author\`s experience in both secular and Islamic finance help him to provide a practical and relevant commentary on the state of the modern financial system and the Islamic alternative. A description is given in detailed but accessible terms of the extent to which interest-based finance is now affecting humanity and a passionate case is made for reform of the fractional reserve banking system. In a critique of modern Islamic banking and finance, some searching questions are asked of the practices that are currently in vogue, and a new model is proposed based upon traditional understandings of Islam. This edition adopts a standard transliteration scheme for Arabic terminology and includes a wealth of academic and popular references for readers who wish to delve deeper into the topic.