If you could test your son for a gene that predicts violence, would you do it? From the author of Curfew comes a suspenseful, heart-wrenching novel about the consequences of your answer.

Antonia and Bea are sisters, and doting mothers to their sons. But that is where their similarities end.

Antonia had her son tested to make sure he didn’t possess the 'violent' M gene.

Bea refuses to let her son take the test. She believes his life should not be determined by a positive or negative result.

These women will go to any length to protect their sons.

But one of them is hiding a monster.

And there will be fatal consequences for everybody....