The Depths of the Sea by Jamie Metzl
It's 1979 and Morgan O'Reilly, a dispirited CIA desk officer is desperately trying to bury his memories. Sent to Cambodia as a marine during the Vietnam War, he was given the task of creating a secret spy unit of orphaned street children. At the end of the war, he was only able to get one child out of the country, his surrogate son, Sophal. Years later, Sophal, who is now a CIA agent, disappears on a secret mission in the Cambodian refugee camps in Thailand and O'Reilly is the only person capable of finding him. Filled with the fascinating workings of the Cambodian refugee camps, the life or death politics of Washington, D.C., and the inner workings of the personalities that are drawn to such extreme circumstances, The Depths Of The Sea is a thriller that both entertains and educates.