While I like animals, I usually don't usually enjoy the mysteries set in wildlife sanctuaries or horse camps/farms/shows as much as other settings because they seem to show up frequently in this series. However, since this mostly takes place at a winter carnival, a unique locations to the series, I can live with the wolf sanctuary.
I enjoy details that make Nancy's world seem real, like the sleuths' various jobs at the carnival. The plot was complex, and I didn't suspect the actual perpetrator until just near the end. A suitable ending to the Nancy Drew Mystery Story series which ran 70 years, from 1930-2003.