Isobel gets entangled with victims of an unethical doctor in her expose of an in-vitro clinic; Kennedy sends Dennis to Halifax to find a baby girl cloned by a bizarre cult group.

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.