The Amateur Detective by Peter Zander-Howell

In 1950, a woman is found dead under the uniquely-banded cliffs at Hunstanton in Norfolk.
Scotland Yard is called in to investigate, and Detective Chief Inspector Bryce takes charge.
A local amateur detective, with extensive knowledge of both real and fictional murders, contacts the DCI.
For some time neither he nor the police seem able to find anyone with means, motive, and opportunity.
Eventually, someone ends up in the dock at the Norwich Assizes – but the drama is not yet over.