They met when they were teenagers. Quiet, poor, perhaps even a little dull, Miguel fell for languid Alicia during their long walks back from school. Then Lucas arrived and changed everything, entrancing Alicia with his confident bohemian charm. Miguel could not compete. But he stuck around and, against all the odds, was the one Alicia ended up marrying.

Now, eleven years later, their marriage has begun to fray, and Alicia sets out to see Lucas again. Yet gnawing at each member of the ménage a trois is the knowledge that, somewhere along the line, something has gone badly awry.

In a final heady whirl of sex and obsession, treachery and blame, they all struggle to ascertain: who among them is to blame?