A serial killer is loose. The President is dead in the locked Oval Office. Others die and no one has ever seen the killer or knows how many he has killed. Henry Morris is a peculiar psychopath - hard to remember and never noticed as he comes and goes. He was like the Astronomer's concept of Dark Matter, 95% of the known Universe, unseen but with a profound influence on how the galaxies move and the stars take their positions. San Diego and the surrounding area are the principal venues for the pursuit of this madman. It takes a mild-mannered Washington bureaucrat, unschooled in police work, to come up with the right stuff. Even then Henry manages a few unexpected tricks. This tale will have you wondering whether that person you never noticed at the mall or in the supermarket has changed your life forever. Maybe tomorrow you should give a prayer of thanks that you survived that unnoticed meeting.