As a top Madison Avenue executive, Eric Sebastian vacationed often in Mexico. When he decided to pack in the rat race, he resigned from his post at giant BBDO and moved to Mexico City, and later to Acapulco. As a member of both the American and Mexican communities, he lived and worked there for 15 years. His writing - with touches of Mickey Spillane - reflects his intimate knowledge of Mexico and its people. Not since B. Traven (Treasure of the Sierra Madre) has a foreigner written so penetratingly about that country and its people.