D.I. North re-investigates an eight-year-old murder case and finds that Det. Supt. Walker was in charge of the inquiry. She begins to suspect that he's covering something up and he is suspended from duty. He returns to his roots to find new evidence to prove his innocence, in order to save his career, relationship and reputation.

D.I. North re-investigates an eight-year-old murder case and finds that Det. Supt. Walker was in charge of the inquiry. She begins to suspect that he's covering something up and he is suspended from duty. He returns to his roots to find new evidence to prove his innocence, in order to save his career, relationship and reputation.