Anastasia leaves her comatose husband Denis in the US to join Samson in Estonia and help him get to the bottom of things. Soon it becomes clear that Denis and Harland were running an investigation into a spectral former Stasi agent and her sprawling network of assets across industry and government in the US and the UK when they were attacked. Samson and Anastasia must tap into their research and expose the spymaster before any more people are killed or agencies compromised.

An astonishing and timely thriller examining the penetration of Russian assets into all levels of western life, The Old Enemy is a complex, breathtaking race against time from "one of our most accomplished thriller writers," (Financial Times).