It's a crisp spring morning when Cass drops her husband, a respected lecturer, to the beach for his medically prescribed swim. While waiting for him, something catches her eye. A young woman runs towards her husband and embraces him - until he holds his hand over her face and she falls down on the stones, dead.
In the backseat of the car, their seven-year-old son sits quietly. When her husband returns, he says nothing. Neither does Cass. Afraid to speak up in the immediate aftermath, Cass embarks on a solitary quest to unravel what has taken place.
Cass is quickly drawn into a web of lies that pulls her back to the previous autumn, when a beautiful Italian postgraduate student finds herself subsumed by an inescapable desire. It's visceral. It's destiny. But sometimes destiny can kill...