The Solitary Man by Stephen Leather

Chris Hutchison is a man on the run. Imprisoned for a crime he didn't commit, Hutch escapes from a British maximum security prison and starts a new life in Hong Kong. Then a ghost from his past catches up with him, forcing him to help a former terrorist break out of a Bangkok prison. Or face life behind bars once more.

Meanwhile the DEA wants to nail the vicious drug warlord responsible for flooding the States with cheap heroin. And decides to use Hutch as a pawn in a deadly game.

Hutch's bid for freedom takes him into the lawless killing fields of the Golden Triangle, where the scene is set for one final act of betrayal . . .