These days Chris Thrall is a successful British author. But, it wasn't always so. In the 1990s he left the Royal Marines to find his fortune in Hong Kong, but instead found himself homeless, and hooked on crystal methamphetamine. In a downward spiral, he also began working for the 14K triad society as a doorman in one of their nightclubs in Wan Chai. Dealing with psychosis and paranoia, this "foreign triad" had to survive in the world’s most unforgiving city, addicted to the world’s most dangerous drug. "Eating Smoke" is his story.

We at Radio 3 asked him, after an interview on Morning Brew, whether we might serialise it for radio. Chris and his publisher immediately agreed, and this Saturday at 8.30am you can hear the final part of the story.

In th​is week's final episode​ , Chris pays the price for what has now become a chilling way of life. He experiences a catastrophic psychotic meltdown, during which the line between reality and imagination no longer exists. There is now only one thing left to do...

"Eating Smoke" is read by Nicholas Atkinson, abridged for radio by Alan Sargent, and Directed and Produced by Phil Whelan, Pete Spurrier, and Chris Thrall. (Saturday, 8.30am)