Vengeance is Mine by John MacRae

Blurb

The Vengeance Man is back from the dead. For one last mission.

Former intelligence operative Mike Farrah thought he was done with spies, assassins and secret wars.

Then his old handler comes calling.

A ruthless enemy cell is operating on British soil. The government needs bait.

Mike must become The Vengeance Man. A black-ops legend. A vanished assassin. A ghost everyone believes is buried.

Then Mike learns the truth about Dawn. The woman he loved didn’t die by accident.
She was murdered.

And the people who killed her are the same people now hunting him.
This isn’t just a mission. It’s revenge.

Because Mike Farrah has one chance to expose the killers.

One chance to avenge Dawn.
And one chance to survive being the most wanted ghost in Britain.