Josh, a kind-hearted university student, impulsively steals two research mice and hides them in the basement of Harewood Hall, where he works. But these aren't just any mice—they could carry a deadly disease.
As disaster looms, the residents of Harewood Hall—including a cat named Harley, a dog called Bobby, and a cast of quirky retirees—must band together to save the day. But with mysterious packing boxes, a spike in the water bill, and secrets lurking around every corner, can they uncover the truth before it's too late?