Morse investigates a tangled web of university intrigue which surrounds the baffling murder of Dr Julian Dear, a college don and famous environmentalist who was killed just minutes before he was due to give a controversial lecture. It seems that the most respectable of academic families can have skeletons in the cupboard, and Morse has to put his job on the line to get at the truth.

Morse investigates the murder of Trevor Radford, managing director of the family-owned Radford's Brewery, who was attacked and killed while working late. Morse becomes immersed in the implications of a hostile take-over bid by another company. Then Helen Radford goes to the brewery to look for her missing husband Stephen and finds him also murdered.

Morse finds himself at the top of the suspect list when his lady friend, Beryl Newsome, is stabbed at a dress rehearsal for the local amateur dramatic society's production of The Magic Flute. Then Lewis starts uncovering more incriminating evidence, and Morse becomes the target of direct attacks. Who is it that wants to get at Morse so badly?