Strict vow of secrecy

2,700 years later, the Eleusinian Mysteries are still mysterious

At the end of Agatha Christie’s play ‘The Mousetrap’, the audience is urged not to give away the plot to friends or aquaintences. The murder mystery is widely considered the longest running West End show, with over 29,000 performances since 1952.

I suppose part of its enduring success is the performance itself, fine-tuned to a fault. But part of it, I re…