In this work, the author has combined the efforts of early scholars, like Ibn al-Jawzee and Ibn Rajab, with that of modern scholars like Saleem al-Hilaalee and Abdul Azeez Abdul Lateef, to study the spiritual disease Riyaa. The result is a very comprehensive, yet concise, treatise on the subject of Riyaa in which all the Hadith references are verified and authenticated, as well as English Hadith references identified. It is without a doubt, a very important addition to the English Islamic library, which presently lacks any specialized works on the topic. Its importance cannot be over-stressed, because the character which Islam seeks to build would be incomplete without a clear understanding of this subject.