Ghost Money by Andrew Nette

Cambodia, 1996, the long-running Khmer Rouge insurgency is fragmenting, competing factions of the unstable government scrambling to gain the upper hand. Missing in the chaos is businessmen Charles Avery. Hired to find him is Vietnamese Australian ex-cop Max Quinlan. But Avery has made dangerous enemies and Quinlan is not the only one looking. Teaming up with a Cambodian journalist, Quinlan's search takes him from the freewheeling capital Phnom Penh to the battle scarred western borderlands. As the political temperature soars, he is slowly drawn into a mystery that plunges him into the heart of Cambodia's bloody past.

Ghost Money is a crime novel, but it's also about Cambodia in the mid-nineties, a broken country, what happens to those trapped between two periods of history, the choices they make, what they do to survive.