Josh is a sweet, well-meaning university student with a big heart. After he impulsively steals two research mice from a campus laboratory, he hides them in the basement of the retirement village where he works. The mice are happy and so is Josh, until he discovers that the lab mice could cause a deadly disease. Enter a cat called Harley, a dog called Bobby, the arrival of some mysterious packing boxes, and a strange spike in the village’s water bill. As the clock ticks, and disaster looms, can the efforts of the Harewood Hall residents save the day?