Dennis investigates a vigilante incident; Megan loses her unerring objectivity while profiling a brain surgeon who can't save himself from brain cancer.

When a diplomat's son is killed by a car bomb, what appears to be a terrorist attack turns out to be a personal vendetta with tragic consequences.

Dennis investigates the motives of a well-to-do housewife who returns home after vanishing without a trace five days earlier. Isobel profiles a profiler with a vicious speech impediment. A stubborn Kennedy refuses to beg Megan to come back to The Eleventh Hour.