The Swimmer by Joakim Zander Harper Collins, $27.99, 417 pages, ISBN 978-0-06-233724-5 International thrillers—good old spy yarns—have long been favorites of many readers around the world. Personally, I never tire of them. It seems however, that all the great espionage writers have passed . . . novelists like John Gardner, Ian Fleming, Robert Ludlum, Tom Clancy, Steig Larsson, Graham Green and Eric Ambler have all left us and perennial