The third book in the series - The Path To Vengeance.

As the years roll by, the units existence and threat fades into the past. The surviving members have grown old living in peace. Or have they? When all the units’ members die in accidents in the same week, Peter Moustaffer, Ali's son, senses something is not right. Setting out to find the truth, Peter is pulled into his father's world, on a path to vengeance.