The Castaway Hat is an amusing intrigue of lure and lucre, spanning two generations. A mystery of a straw hat with a faded red ribbon washed among the rocks. The finder, Edgar, by co-incidence, not that he knows it, met the owner the previous night at a book launch. Daphne and the hat were parted when a launch capsized - she swimming to Coromandel, a New Zealand island, only to discover an old gold mining tunnel, a recently worked old mining tunnel...