Danny Dunn on the Ocean Floor

A good entry in the series. As an adult, having much of the plot being driven because Danny is foolish is a little annoying. As a kid, I never noticed this.
The story holds up to modern times.
It's nice to see a girl (Irene) in a boys book portrayed this positively.
So you can gives these to your kids, confident that Danny is shown to be a bad example and Irene is a role model.