A St. Paul art history professor who secretly photographs women and then kills them is John Sandford's villain in his new book "Chosen Prey." In the 12th book in a best-selling series, Sandford's detective hero, Lucas Davenport wrestles with his personal life even as he chases the serial killer through the Twin Cities. Sandford was a reporter for the St. Paul Pioneer Press newspaper. He left journalism several years ago to begin writing the "Prey" books.