When Moretti receives a deathbed confession about the hit-and-run murder of a teenager from 1992, she calls on Pierce to determine the ailing man's credibility. The case becomes complicated, however, when the alleged killer's physician, Dr. Hutchins, reveals that his patient's tumor has mysteriously disappeared. Pierce and Moretti must dig deeper into the past to uncover the truth behind a shocking series of apparent homicides.

Donnie tries to help a war hero suffering from a neurological disorder, but what starts out as a good deed ends up having major implications. Meanwhile, Pierce gets an unexpected surprise when a fling from his past shows up.