It's less than a month till the US presidential elections. A bomb goes off in an LA mall. It's a suicide bombing, carried out by a British Muslim girl. The FBI trace her arrival on US soil, realise she wasn't alone, and that the LA attack is only the beginning.

In Florida, a mother fears her son has been radicalised. In London, the police bring in a Muslim immigrant for questioning about his child's whereabouts. The two parents are thrown together in a race to find their kids before it's too late. Will they succeed?

Will the FBI hunt their children down? Or will both fail to stop the teenagers committing an atrocity which derails the country's future?