The Spanish language author who has had most impact in United States has been Roberto Bolaño. Overall, contemporary literature in the region is vibrant and varied, ranging from the best-selling Paulo Coelho and Isabel Allende to the more avant-garde and critically acclaimed work of writers such as Diamela Eltit, Giannina Braschi, Luisa Valenzuela, Marcos Aguinis, Ricardo Piglia, Roberto Ampuero, Jorge Marchant Lazcano, Alicia Yánez, Jaime Bayly, Alonso Cueto, Edmundo Paz Soldán, Gioconda Belli, Jorge Franco, Daniel Alarcon, Víctor Montoya or Mario Mendoza Zambrano. Other important figures include the Argentine César Aira, the Peruvian-Mexican Mario Bellatin or the Colombian Fernando Vallejo, whose "La virgen de los sicarios" depicted the violence in Medellín under the influence of the drug trade. Emerging voices include Fernando Ampuero, Miguel Gutierrez, Edgardo Rivera Martinez, Jaime Marchán and Manfredo Kempff.