"I'm Mia. I know how to write. Why's that a big deal? Because... I'm a cat." Someone is telling the tabloids about Ms. Thornblood's every move. Is it the housekeeper? the cook? the maid? the handyman? The detective hired to solve the case isn't sure. Things are looking pretty hopeless until Mia, his talented cat, offers to spend a week at Ms. Thornblood's as a spy. With time running out, and an embarrassing secret about to be revealed, will Mia be able to save the day-and solve her first case?