Brothers Jack and Benny Putnam are being dragged against their will on a boring, summer-long vacation with their family in Chowder Bay. But what promises to be a very bleak summer quickly becomes a series of exciting adventures in one of the most mysterious places on earth!

This third volume has the boys investigating a 19th century murder, a famed elixir, and an unusual ghost. As with everything else in Chowder Bay, not everything is as it appears.