Hector the Collector, once a lonely and grumpy mouse, finds joy in sharing his prized possessions with the mice of Mouseville after a devastating storm leaves many in need. As he shares his treasures, he discovers the happiness that comes from generosity and friendship. Turning his collections into a museum of unusual things, Hector creates a space for the community to admire and enjoy his treasures, ultimately changing his reputation from grumpy to generous.