Henryk Böll’s novel “Under the Guard of Care” is devoted to the problems of terrorism. In the author’s last major works of prose—“The Lost Honor of Katharina Blum,” “Under the Guard of Care,” and “Women by the Rhine”—his gift for seeing in a private fate a reflection of the destinies of an era, his “reportage” style, and his impeccable precision in characterizations appear with vivid, almost classical fullness.