In a forest live three clans. Shade, Wolf, Moon. Normally there would be a fourth, however not a single living cat knows of the fourth. Mysteries say that they were weak and there for other clans killed them off one by one for territory. Some say there is no clan, some say there is but its hidden. Could there possibly be a fourth clan? That is the goal at which the clans which to find out. While living their own lives, they try to unravel the mystery without causing any hell from other clans.
The question is, are you ready for the challenge. No clan knows what lies before them, and what the cats of the fourth clan might be like. But that won't stop them from finding out. What happened in the past that they didn't know about? Will it be the medicine cats who get answers from ancestors, or will it be a brave warrior who crosses the border lines to investigate.. is it possible all three clans will work together to find the final clan?
The true question is.. is there a fourth clan, or is it just a myth?