In “One for Sorrow,” identifying the remains of a body discovered in a well appears to be an insurmountable task for Inspector Robbie Lewis (Kevin Whately) and CS James Hathaway (Laurence Fox). Lewis, recently out of retirement, has to prove himself to a new boss and Hathaway finally gets to know his estranged father. Meanwhile, the death of a young artist begins to look like murder. Is there a connection between the dead body in the well and the murdered artist?