Former heroin addict Tommy Jarret, invigorated by the prospect of staying clean and writing a book about his newfound recovery, is suddenly found dead in his Strathbane chalet -- the victim of an apparent drug overdose. Lochdubh constable Hamish Macbeth, however, senses foul play. Recruited to work undercover with tough Glasgow Detective Inspector Olivia Chater as a husband and wife team, Macbeth dons Armani to dive into the underworld as an international drug baron -- and root out the Amsterdam drug cartel secretly entrenched in the Scottish Highlands.