Marcello Mansini has been dead for more than two months, his body lost in the icy depths of Lac Leman.

But when Aaron and Rebecca stumble across his gravestone, their hearts full of human despair, Mansini slips into their lives like the ancient viper he is.

Soon, very soon, he will summon them both into the freezing darkness of the lake … but only when their fear and horror have reached sickening heights.