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Hiriwa the dolphin grows up fearing the ''dark shapes'' that take creatures away in their ''invisible threads''.
One day his best friends get caught and he must act bravely to save them.
The muted illustrations have a fuzzy, underwater quality, which may not appeal to all children and it is a bit scary in places.
However, the information in the back is a nice lesson for children about Maui's and Hector's dolphins and how a set net works. Ages: 3+.
- Laura Hewson is an Allied Press subeditor and mother.