Sam has just accepted a very unusual job: become the assistant to an amoral, immortal, blood-sucking vampire.

From an ominous Lecturer, a small 1930s middle American community learns of the Harper Affair, in which young Jimmy Harper finds his life of promise turn into a life of debauchery and murder thanks to the new drug menace marijuana. Along the way, he receives help from his girlfriend Mary and Jesus Himself, but always finds himself in the arms of the Reefer Man and the rest of the denizens of the Reefer Den.

Tribes tells the story of an African American, an Arab-American and a white guy who try to rob a subway wagon. Because none of them wants to rob people of their own race, it sets them off to a series of arguments over self-identity. This leads the would-be bandits to continually divide the passengers into various ethnic, cultural and economic subgroups in an effort to find a class of people that none of them identify with - a group they can feel good about robbing. When the train arrives at the next station, no one expects that the situation would be reversed. Self-identity is truly a bitch.