I have never read any of the "Prey" series by John Sandford and thought the latest one might be as good a place to start as any.  Buried Prey is #21 in the Lucas Davenport series, but it didn't matter that I hadn't read the previous books in the series.  In Buried Prey, Lucas Davenport is haunted by an old unsolved case of two missing girls from the mid 1980s.  In present day, a house demolition results in the uncovering of the two girls bodies buried in the foundation.  This finding launches Lucas into re-opening the case and hunting down suspects and witnesses from long ago.  The writing and pacing kept me interested and this was a great introduction into the Lucas Davenport series.