Click on a letter in the master index above - - to jump to a index by author, series, or theme. The selected index will then appear to the left of your screen

Then click on an left-hand entry to jump you to the main author listing, or (in the case of series with three or more authors) a series. The main listing will appear in this part of the screen.

Welcome to The Four-Part Trilogy: a Checklist of Series and Sequels
in Science Fiction, Fantasy & Horror!

Four-Part is updated continually. Please note it is a reference checklist, not a list of 'in-print' books or stock holdings.