Prime Suspect 6: The Last Witness (2003)

The story finds Tennison, 54, now a high-ranking Detective Superintendent at the London Metropolitan Police, managing the big picture on dozens of murder investigations. But Jane can't resist taking a hands-on role investigating the brutal torture and murder of a young Bosnian refugee.
When her prime suspect turns out to be a "minor" war criminal given a new life in the UK after identifying higher profile war criminals, Tennison's quest for justice becomes increasingly complicated.
And as the case threatens to bring an early end to her career, Tennison faces the stark realization that she has little else left in her life, and everything to fight for.