Secret Water

John, Susan, Titty and Roger, the crew of the Swallow, take on the job of mapping the mass of small islands round Pin Mill while living on the biggest one. But who are the mysterious savages who lurk in the islands - and is the tribal totem they find in their campsite a threat of attack.

Product Description
If you don't know your incest taboo from your Oedipal complex, and you want to understand more about the culture we're living in, then Totem and Taboo is the book to read.