What is the main conflict in Dog Soldiers a Novel by Robert Stone?

Converse realizes that his time in Vietnam will produce nothing so he decides to agree to smuggle 3 kilos of heroin into the US. In Converse's mind, he has a sure plan. With the help of friend and merchant marine Ray Hicks, Converse can make $40,000. However, Converse is extremely naïve and things quickly go awry.