Shelly Seaver is stabbed to death after a violent struggle and marked with a carved bloody Y, the MO of a Boston serial killer. A similar knife belongs to motor-rider Travis Peck, but it's the wrong size. Traces under Shelly's fingernails of a fish species common in Boston and scratches allow Horatio to find fisherman Lucas Wade, who even has the alleged 'criminal gen', an XYY chromosome. While Lucas is in custody, a new Y-carved victim is discovered by her brave young son Arthur, but soon found not quit identical, and traced to Lucas' logical accomplices. Meanwhile Ryan has a hard time with another part of his past, and Eric with jealousy when Calleigh dates a handsome lawyer. The Wade story proves more complicated...
Did You Know?
The biker is supposed to be loosening the lug nuts on the prison van but is shown turning them clockwise. This would tighten them. See more
Performed by Will Dailey See more