"When Nick Flynn left the US Air Force to join the Quartet Directorate, he did so with the full knowledge that no one could ever know. This covert private force--called Four by its members--promised him the chance to lead his own missions and make his own decisions, though the risks are high. When a former senior CIA executive goes dark, Flynn and his team--including the daring Laura Van Horn--are ready to step in. What begins as a quiet check on his home turns into a firefight against a familiar enemy who is more dangerous than ever."