In a reimagined contemporary Edinburgh, in which a tectonic fault has opened up to produce a new volcano in the Firth of Forth, and where tremors are an everyday occurrence, volcanologist Surtsey makes a shocking discovery. On a clandestine trip to The Inch - the new volcanic island - to meet Tom, her lover and her boss, she finds his lifeless body. Surtsey's life quickly spirals into a nightmare when someone makes contact - someone who claims to know what she's done...