A self confessed murderer extradited, brought home, only to claim his innocence, point the finger at a Very Important Person, then kill himself.

An off-the-books investigation turns up a secret history of sexual misconduct, greed, and bribery. A great big can of fat, wriggly worms is unwittingly opened when Matt takes a dead son's letter to a grieving mother. He finds he's accepted a task that could cost him his job, unless the biggest worm in the can really does happen to be the one he's not supposed to catch...

Source: Seven