An edge-of-the-seat thriller set against an urgent contemporary backdrop, "Unthinkable” begins as a Muslim extremist (Michael Sheen) places three separate nuclear bombs in mystery locations around America. With our country's entire counter-terrorism force rushing to action, the culprit is soon apprehended, but the whereabouts of his bombs remain unknown. Heading up the investigation-or so she thinks-is FBI agent Helen Brody (Carrie-Anne Moss), an expert in her field, who has only two days to find the bombs but who, unfortunately, is n