Son Complex by Kris Williamson

Aaron, a 23 year-old American, comes to Malaysia for the first time. His mission: to meet Nasri Aziz, the politician he believes is his biological father. A man who has no idea Aaron even exists. Encouraged by the letters of his late mother Nora, Aaron seeks to find out more about her life in Malaysia in the 1980s. Aaron's arrival comes as a complete surprise not only to Nasri but his wife (who wants to be known only as Datin) and son Iskandar, a teenager who leads a darker double life. While working to gain their trust, Aaron discovers a complex background of secrets and lies. And it is up to Sundari, the controversial NGO activist who was Nora's confidante in Malaysia, to reveal the shocking truth.