From the back cover:
Since 1976, GMs have run adventures in the Round House Modular Dwelling Unit (RHMDU) found on page 27 of the Metamorphosis Alpha rule book. This booklet now provides GMs with additional advice for designing challenging and unique encounters in their own RHMDUs as well as providing a sample adventure which demonstrates how much fun (and how dangerous!), even the most familiar of places can be on the Starship Warden.
This book contains a sample adventure, words of wisdom from James M. Ward himself and a heap of tables that will allow any under-the-hammer, hyperventilating GM to create a quick adventure on the fly and stock it with weird and wonderful items and creatures.