"Magnus 'Steps' Craig is part of the elite three-man Special Tracking Unit of the FBI. Called in on special cases where his skills are particularly needed, he works as a tracker. The media dubs him 'The Human Bloodhound,' since Steps is renowned for his incredible ability to find and follow trails over any surface better than anyone else. But there's a secret to his success. Steps has a special ability--a kind of synesthesia--where he can see the 'essence' of a person, something he calls 'shine,' on everything they've touched ... When the remains of a murdered woman are found, Steps recognizes the shine left by the murderer from another crime scene with a physically similar victim. And he uncovers the signature at both scenes--the mark of a sad face"--From publisher.