Astola is used as a base for fishermen who frequently visit the Island between September and May to catch fish in general and lobster and oysters in particular. Between June and August, the Island remains free from human interference due to rough sea and high tides. On finding a small Island ideal, the fishermen decided to bring their cats along in order to rid it of its resident vermin. What they do not realize is that by doing this, they trigger a change of events that leads to destructive changes in the Island’s habitat. A few fishermen and their pet cats on a trip to Astola unwittingly can almost destroy this unique ecosystem.