Watchmaker Hermux Tantamoq is a hardworking mouse who is thankful for ordinary things: donuts, coffee, peaceful evenings at home with his pet ladybug. But his quiet life takes a dramatic turn when Ms. Linka Perflinger, dashing daredevil aviatrix and adventuress, bursts into his watch shop, drops off a broken watch, and steals his heart.

Hermux can't wait to see Ms. Perflinger again, but she doesn't return. Instead, a shady-looking rat comes in and damands her watch. Fearing something is amiss, Hermux follows the rat, and soon finds himself in the middle of a dangerous web of deception and intrigue.

What has happened to Ms. Perflinger? Who is this mysterious Dr. Mennus he keeps hearing about, and how is he connected with Hermux's eccentric neighbor, cosmetics tycoon Tucka Mertslin? Hermux's life is suddenly full of twists and turns and is anything but ordinary.

He must be daring. He must be vigilant. And he doesn't know how. But as sure as corn is sweet and cheese goes moldy in the rain, Hermux must rescue Ms. Perflinger and, in the process, find out just what kind of mouse he really is.