The Detonator by Vincent Zandri Polis Books, $25.99, 287 pages, ISBN 978-1-943818-88-4 Psychological thrillers are among the most popular of modern crime fiction works, because they give readers a long and hard look into the hearts and minds and motives of people who are far outside of the usual norms of society.  The Irish and Brits call them nutters . . . while we Americans simply call them what