When a newspaper article tells Helena Campbell, whose impending arranged marriage is less than a love match, that seeing the green ray is an indication of true love, she refuses to marry anyone until she has seen it. Her quest to view the green ray takes her on an island-hopping tour of the Hebrides that nearly costs her her life, and Helena must ask herself - is seeing the green ray worth it? With which of her suitors will Helena see the ray? Or will she never see it at all?