Ken Goddard's First Evidence series centers on what may prove to be evidence of extraterrestrial contact. In this third book, crime scene investigator Colin Cellars wakes up in the maw of an fMRI machine at a remote military hospital, having no memory of who he is or how he got there—but he quickly becomes aware that he is being hunted.

His instinctive response is to run, and he must rely on his new, incredibly enhanced sense of music and tone to trigger fragments of memories that may help him discover who is friend, who is foe—and who is something else entirely.