According to the author's website this book:

• Provides an overview of Common Lisp for the working programmer.
  
• Introduces key concepts in an easy-to-read format.
  
• Describes format, typical use, and possible drawbacks of all important Lisp constructs.
  
• Provides practical advice for the construction of Common Lisp programs.
  
• Shows examples of how Common Lisp is best used.
  
• Illustrates and compares features of the most popular Common Lisp systems on desktop computers.
  
• Includes discussion and examples of advanced constructs for iteration, error handling, object oriented programming, graphical user interfaces, and threading.
  
• Supplements Common Lisp reference books and manuals with useful hands-on techniques.
  
• Shows how to find what you need among the thousands of documented and undocumented functions and variables in a typical Common Lisp system.