Melanism: Evolution in Action (ISBN 0-19-854982-2) is a book by Dr. Mike Majerus, published in 1998. It is an update of Bernard Kettlewell's book The Evolution of Melanism. The book contains a very useful summary of Majerus' work on melanism in ladybirds and a review of the peppered moth story, including observations on moth behavior which sparked controversy. It may be criticised for being unevenly edited so as not to suit any one audience in its entirety. For example, it explains the basic principles of evolution such as the Hardy-Weinberg law in earlier sections, and in later sections includes graduate level concepts.