C. Inc. is basically more of a collection of manuscript documents, written during high school, and compiled here unedited.
SSS is the continuation of the story rougly fleshed out in C. Inc. In SSS, the character of the Detective and that of the elusive Cheshire Sam are fully formed, and their science fiction world fully realised down to the most minute detail.
covering the longest span of time of all three, the final installment of the Cheshire Sam Trilogy finds the treacherous General Tso gaining ultimate power over the animal factions, only to lose it all for his bride, and of course, the final confrontation between the detective and Cheshire Sam.