Ted Case joins the team to reopen the murder of vicar Leonard Whitechurch, a white man with a black wife who was stabbed in 2006 after receiving racist hate mail. His widow Alicia tells them that his curate Wendy had a crush on him but she hung herself two years after his death. The poison pen letters are traced to ex-convict and white supremacist Kevin Duncan but Ted believes the motive to be more complicated than purely racial. Duncan admits he wrote the letters in revenge as the victim disapproved of his dating his daughter Sally but a revelation from Leonard's younger son Luke exposes a rift in the family and leads to the solution of the murder.