Not bad for the first in a new series. I liked the characters and setting, the plot was predictable but enjoyable. The only criticisms (if you can call it that)are

Spoiler

I thought the cats' role could've been more defined. Their vague behavior were meant to clue Katz in to what was going on, but she never seemed to get a clue. At least in The Cat Who books, Qwill would get the hint by the end of the book. But Katz isn't as perceptive, apparently. Also, who did the book belong to? I guess Vivian, but that wasn't quite clear.

Second, nitpicky, but in the first chapter, a character describes Erie as "Hicksville" which probably wouldn't mean much to most people, but on the other side of the state is Hicksville, OH, a small town east of Fort Wayne just over the Ohio state line. I thought it made it harder to set the scene, I had to keep reminding myself Indy, not Ohio.

Overall, a great start and I look forward to reading other books in the series.