'Rhiannon' weaves classic Celtic legends of revenge into a modern-day setting in a run-down Welsh country house and grounds. The game is aimed squarely at the first-person point-and-click market. Although it is violence-free, it is decidedly not for young children. Its intricate plot deals with numerous grown-up themes from the ancient to the contemporary. It blends magic with technology, fact with myth, horror with compassion and classicism with metaphysics. It is a feast for lovers of ghost stories, mystery, legend and puzzles.