On vacation at her aunt's villa in Portugal, Jennifer is attracted to both Neil and Philip Alenquer, two brothers who live in an old castle overlooking the sea. But Jennifer soon senses that something is wrong, though it is not clear where the intangible clues are leading. Words left unsaid; the burnt-out shell of a cottage; terror in response to the recitation of a poem; gunshots on the beach. It is a mystery with potentially deadly consequences, as Jennifer and her aunt learn when an arsonist sets the villa alight ...