Between this and the Three Investigators, I seem to be on a vintage fiction kick (and it's not even July!). I'm not sure if my mom read this as a young girl or just happened to have a copy, but it's one of several '60s paperbacks I grew up with and loved. It actually inspired me, at the age of twelve or so, to write a very similar story (young girl with a father who owns an antique store)... maybe I should get on that. Anyway, it's a fun little romp that, for a mystery novel, actually isn't too farfetched and includes a nice focus on the friendship of Nina and Muffin. Automatons, away!