I read this in Grade Five, and haven't since. Lately I saw it come up as a related read to contemporary art and other middle grade mysteries, and I'd forgotten it had that mystery element. It was a great re-read, absolutely timeless in its storytelling and characterization. Despite it taking place when it was written, in the 1960s, the characterization of Claudia and Jamie were both so immediately identifiable that it would take only slight changes to make it take place in any other time period. It's very short, and a modern version would likely delve more into the hidden familial relationship between some of the characters. Such a great book, I think young kids would enjoy this as much as teens and adults. Claudia is especially such a well-rounded, contradictory, realistic tween girl character, and Konigsburg captures both her and Jamie's character entirely through dialogue. Incredibly well-written, very recommended.