George Felse, wife Bunty and son Dominic were vacationing rather uneventfully at Maymouth, in Cornwall, when they were unexpectedly drawn into the beguiling legend of Jan Treverra and his beloved Morwenna. When Felse assists in having their tombs exhumed, he pulls away the stone on an even greater mystery. This corpse covered in sea brine, had died about two days before.