M

aths professor Adam Capstone is killed by a parcel bomb. Whilst his brother David, with whom he fell out over money, points the police to threatening letters Adam received his wife Elizabeth admits that he was a philanderer and Frank Guitteau claims that Adam raped his student daughter Paula, who committed suicide after he was acquitted. Sarah Alderwood, carer for Elizabeth's invalid father Donald had a child by Adam and student Kate McMurdock accused him of plagiarizing her work. All are suspects. Then David receives a parcel bomb and Lewis and Hathaway are with him when it explodes.

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