We're studying reptiles for Nature Study this term, and chose this book as a fun morning time addition that could engage all four of my children - ages 5-12.
It was definitely better for the younger two, as expected, but the older two didn't mind speculating about the egg-stealing culprit. They were not pleased with the ending, but as an adult and a writer, I was fine with it. No loose ends, at least.
As an educational supplement, it accomplished what I hoped. We learned about sea turtle nesting habits, the dangers they face, and learned terms like "arribada" and "imprinting." We also learned about several occupations that might inspire the children - ranger, restaurant owner, artist, and excursion guide, among others.
This was a short, worthwhile read. The Aldens are a fun sibling set, and I liked that they have plenty of freedom to adventure AND a responsible and loving caregiver. As a homeschool mother of four, it's always nice to see children capable and willing to watch out for each other and interact with the wider world around them beyond their immediate peer group.
A side note for those unfamiliar with the series: the first book is essential, and is not a formulaic mystery. The subsequent books are lighter and do not need to be read in order. We own the first eight, and have occasionally grabbed others from the library. This is #151, and we certainly haven't read many between it and the others we own.