The last few weeks have been the most challenging of Miami detective Mike Grooms's career. After being called to assist on a disturbing murder case in a neighboring town, Grooms now finds himself chasing a sophisticated and mysterious killer who is starting to target people in Grooms's own life.

Desperate to track down the killer and stop the murders, Grooms takes over the investigation, but there are more questions than answers. How is the killer picking his victims? Why are the crime scenes so light on evidence? And, most disturbing, what is the meaning of the numbers carved into the...