The Dark Chronicles: A Spy Trilogy: Free Agent; Song of Treason; Moscow Option in Bloomington, MN

It's 1969, and MI6 agent Paul Dark has spent the last twenty-five years betraying his country. When a would-be Russian defector turns up with information about a high-level British double agent, Dark goes on the run—only to discover that everything he believes is a lie.
Bringing together three novels featuring double agent Paul Dark,
The Dark Chronicles
journeys from London to Nigeria and from Rome to Moscow in a heart-pounding saga of dubious loyalties, deadly conspiracies, and ruthless acts of revenge at the height of the Cold War.