Kevin Whately and Laurence Fox return for one last time as Inspector Lewis and CS Hathaway, investigating Oxford’s most difficult murder cases. The pressure is certainly on when Lewis finds himself at odds with his high-flying new boss, Chief Superintendent Joseph Moody, who disagrees with Lewis’ more traditional approach to detective work. Meanwhile, his partner, James Hathaway, is having his own difficulties dealing with his estranged father, who suffers from dementia. Both detectives must put aside their personal issues if they’re to solve the final season’s cases: the death of a young avant-garde artist that at first appears to be a tragic drug overdose, a series of slayings with mysterious links to alchemy, and a parcel bomb attack on an eminent mathematician.