Nothing good ever comes from a midnight phone call. For washed-up spy Harry Tower, it is the worst news at the worst possible time. His son, Sean, has gone missing in Iran after writing an exposé about government corruption. Their relationship has never recovered since Harry's wife's suicide. And Harry, with his career on the verge of disintegration, needs to find him and put things right. When Harry arrives in Tehran, he finds a city on the cusp of revolution. Foreign powers are jockeying for influence, money and oil. The CIA are conspiring to undermine the government with an impending coup, and there are dark mutterings about opium smuggling. But the reasons for Sean's disappearance may be even more sinister than Harry first suspected. Before long, he is on the run - not only from a faceless enemy, but from his own past. Which will catch up with him first?