The Bobbsey Twins on the Deep Blue Sea by Laura Lee Hope - Audiobook

The Bobbsey Twins on the Deep Blue Sea by Laura Lee Hope.
Read in English by Nan Dodge.
This is the 11th in the original series of books about the Bobbseys -- two sets of twins in one family, solving mysteries and having adventures. Bert and Nan are 12, Flossie and Freddie are six. There is a father who works, a mother who stays home, a cook, a handyman, and an assortment of animals. - Summary by Nan Dodge