A book of two halfs.

The first half concerned the two lads Roger and Hall Hunt travelling to the South Seas to collect animal specimens for their father's zoo. A side story involved them being asked to visit an oyster farm to see how it was progressing.

A villain had his eye on the South Sea oyster farm also, and managed to dupe the boys in taking him to where they were hidden. The second half of the book concerns the boys escape after the villain abandons them on the uninhabited island. After lots of ingenuity, luck and near death experiences they finally survive while the criminal gets his cumuppence.

The book then leads straight into the third book of the series underwater Adventure.

Good yarn. Four stars. ( )

As far as I know I read all of these, as a child, younger than 10. I've just recorded a representative few here, on goodreads. Loved them at the time, but that's nearly 1/2 a century ago. ( )