I liked the prologue description of a wolf searching for prey and realizing something was off on the Island. I did think it was odd that by sleeping the Island nourished the wolf then sent him on his way with an agreement to bring nourishment to the island. A pet peeve of mine is when a writer uses several commas in multiple sentences to add to the word count. The description loses its appeal when it becomes wordy.
As far as the cover, it is pretty, but I would have preferred to see the Island rather than a girl.