When an eminent mathematician is killed in a bomb attack, Lewis and Hathaway quickly discover the victim was a notorious philanderer with many enemies. When a bomb is discovered at the home of the victim’s brother, also a mathematician, the case moves in another direction. Then a chemistry professor is murdered. Meanwhile, Lewis’ long-planned trip with his girlfriend is put in jeopardy.
In "Magnum Opus," an Oxford college dean is found bludgeoned to death in the woods following a heated debate in a pub. An alchemic image purposefully left at the crime scene leads Lewis and Hathaway to anticipate that three more murders will follow.
Learn if Lewis, who needs to prove himself to a new boss, and Hathaway can establish a connection between the remains of a body discovered in a well and the death of a young artist. Hathaway finally gets to know his estranged father.