For those trying to determine how many titles are included in the Agatha Christie Mystery Collection published by Bantam I can help. Putnam Berkeley bought the US rights in 1978 which included 87 titles. When they published under the Bantam imprint they published these and in addition the autobiography which makes the collection 88. Dodd, Mead & Co. had owned the rights but were in debt and needed to sell part of their titles. Any titles not owned by them were not published by Bantam so that is why not all her works were included in the set. Also, for those wanting information on her works and the different titles under which they were published can search in Wikipedia under "Agatha Christie Bibliography". It provides a wealth of helpful information.