I quite enjoyed this book and recommend it strongly for any business student (BBA or MBA) who is interested in this topic. For finance majors who don't have a firm grip on credit risk and the instruments used to moderate its effects, this is a must read. It is well written, clearly illustrated, and is not excessively technical.
The six chapters are divided into three parts. 1) What is Credit Risk, 2) Credit Risk Modeling, and 3) Typical Credit Derivatives. The introduction and chapter on credit risk are especially helpful to anyone wanting to gain a more nuanced understanding of what credit risk is.
The middle chapters comprising part 2 discuss the Merton model and options in discussing how credit risk can be evaluated and priced. There are appendices that discuss other models. For the purposes of this book, the discussion here is enough. As a primer, it cannot also be the last word in the technical evaluation of the various kinds of risk and there are other books for the more sophisticated audience (as well as journal articles).
Credit Swaps and Collateralized Debt Obligations are discussed in a few flavors each as the typical credit derivatives. Sometimes people get intimidated or confused by derivatives. However, they are simply other kinds of financial mechanisms that create financial obligations depending on some aspect of the performance of some other instrument. You buy or sell them depending on whether you want to lay off risk and variability to someone else or are willing to buy risk in order to collect the premium and add variability to your portfolio.
A good little book for the right audience.