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I mean, the default setting has a full scenario and quite a few good plot ideas. I ran it based at the Abbey with rats threatening to come down from the north having sent a spy (a fox called Slyver, disguised as a large squirrel) into the area to look out for weaknesses and to sew seeds of dissention against the abbey. There were also a few rats, weasels and shrews in the woods around the Abbey.
If you aren't keen on the default setting, there is another setting called Greyrock Isle, which has more of a Robin Hood feel and if you want to take your games beyond "Medieval Mice", there is a Pirate setting and a Wild West setting.