Bad news usually starts with a phone call. However, the call that came to the home of retired Tamarack County (Minn.) Sheriff Cork O’Connor was different. The look on Cork’s new wife Rainy’s face was chilling. She had received a message from her son, Peter, and though it was garbled it seemed to indicate that he has killed someone named Rodriguez. It's the opening to William Kent Krueger's fifteenth novel Sulfur Springs in his Cork O’Connor series. If you’re a fan of C.J. Box’s Joe Pickett series or Craig Johnson’s Walt Longmire books, then the St. Paul, Minn.