The death of brilliant scientist Dr Brenda Page remained a mystery for more than 40 years - becoming one of Britain's longest-running unsolved murders.
The young and talented 32-year-old was bludgeoned to death in her flat in Aberdeen - the Scottish city famous for its granite buildings and oil industry.
On July 13, 1978, Brenda - originally from Ipswich, England - left her laboratory at the University of Aberdeen where she headed up the genetics department, and joined two rich businessmen for dinner at a plush hotel in the city.
The following day, worried colleagues went to check on her after she failed to turn up for work - and made the grim discovery of her body. Brenda had been beaten to death in a violent and frenzied attack with a blunt instrument. When it was revealed that she'd been living a double life, rumours spread about the identity of her killer.
In this seven-part series, award-winning journalist Ruth Warrander explores three theories as to who could have killed Brenda, before she reveals the shocking truth.
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