Yes, there might be. Many novels are adapted into movies, and if 'the island based on novel' is a well - known one, it's likely to have a movie adaptation.
One possible theme could be isolation. Since it's an island, the characters are likely to be cut off from the outside world, leading to feelings of loneliness and self - discovery.
Yes, 'Shutter Island' is based on a real story. The movie was adapted from a novel by Dennis Lehane, which was inspired by real - life events such as the history of mental asylums in the United States. These institutions often had unethical practices and experiments in the past.
In part, it is. The story takes elements from real-life incidents related to drug trafficking but might have fictionalized some parts for dramatic effect.