The cat who ate Danish modern - Lilian Jackson Braun

Jim Qwilleran is not exactly overwhelmed by his new assignment for the Daily Fluxion. Interior design has never been one of his specialities and now he's supposed to turn out an entire magazine on the same subject.
But the first issue of Gracious Abodes is barely off the presses when Qwilleran finds himself back on more familiar territory - the exclusive residence featured on the cover has been burglarised and the lady of the house found dead...

Now Qwilleran, with the help of Koko and Yum Yum, the brilliant Siamese cats, have their respective moustache and whiskers twitching, and when Koko starts pawing clues in the dictionary and sniffing designer furniture, Qwilleran finds himself doing a feature on a very clever murderer.