What's more of a pest, a man or a mouse?

Susan Winter gets more than she bargains for when she goes back to the family farm to settle her mother's estate. Setting a mousetrap in the pantry seems rather benign, until a dangerously handsome man magically appears. His tearing the mousetrap to bits is one thing, his claiming to live in the house with her, is quite another.

Michael is a loner, but his reunion with Susan is intriguing. They grew up in the same house, in two different worlds. He shows her how he can mutate from a mouse, to a man. This strange anomaly proves helpful, when Susan has to save the farm from the clutches of her greedy aunt. Add her aunt's quirky lawyer, a creepy wannabe boyfriend, a bombshell college roommate, and a snobby architect to the mix, and a mutant mouse is the least of Susan's problems.

Can a mutant mouse with an attitude, and clever plans, help a nerdy librarian keep her family home? Can two lonely creatures overcome their differences, and fall in love?