Bob Moyer reviews something that is new to me: I’ve never read a Japanese police procedural. It sounds as though it’s worth a try. Reviewed by Robert P. Moyer THE FINAL CURTAIN: A Mystery (The Kyoichiro Kaga Series, Book 4). By Keigo Higashino. Minotaur. 400 pages. $29. Don’t worry. It will all become clear. The reader…