Iceland’s most successful author has teamed up with the country’s prime minister to write a mystery/crime thriller that’s one of the best books I’ve read in quite a while. Reviewed by Linda C. Brinson REYKJAVIK. By Ranger Jonasson and Katrin Jakobsdottir. Minotaur Books. 363 pages. $19, paperback. It’s 1956, and Kristjan Krisjtansson, a rookie policeman…