Dragonfish by Vu Tran W.W. Norton & Company, $26.95, 296 pages, ISBN 978-0-393-07780-3 Noir fiction “Emphasizes the human urge toward self-destruction,” and “Focuses on the villain,” according to crime fiction writers James Ellroy and Otto Penzler. Its about the down-and-outers, the losers, the hopeless, unforgiven and abandoned among us who often spend their entire literary lives trapped in self-imposed prisons of the mind. These characters—who attract and repel the