For seven months of the year, the remote island of Lark is fogbound, cut off completely from the mainland. The arrival of three strangers is the cause of much speculation: the first is a charismatic young teacher – the only male teacher on the island – the other two, a mother and her teenage daughter, seeking a place to hide from unspeakable tragedy. What have they come to escape? What will they find waiting for them on Lark? And whose body will soon be found lying in the island's stone circle?