Welcome to the rat world. In this RPG you slip in the fur of a rat and live through adventures in the big rat-castle (an abandoned warehouse). Although the PC rats are very human-like, they still stay rats; they don't walk on two legs, they don't have a thumb (to give thumbs up) and they cannot cook. The rats are distributed in clan-like groups (Rotten) in the various departments of the former warehouse. At the moment there is peace, but that was not always the case and at any time the old hatred could emerge. We are living in dangerous times, for a rat!
--user translated from the German, from the publisher's website
Version 1.2 of the core rules was replaced in 2014 by a slightly expanded edition (V1.3). The rules remained the same, but the rulebook of V1.3 includes two more clans and a second adventure (both previously available separately).