From Murder with Love

Not all secrets stay buried with the dead. The four members of Norcester's crime fiction reading group have been invited as guests of honour to a weekend celebrating the life of the late author of their favourite murder mystery detective novels. But, when the author's secret archive is opened to the public after fifty years, there's a deadly surprise inside. The quartet find themselves embroiled in a mystery that stretches back to the Cold War.
With an accomplished Russian spy close on their tale, a runaway train filled with treasures, and time running out, they will once again have to use everything they've learned from their fictional hero to catch the killer.