Go to a site like JustWatch or Reelgood, search Shutter Island , and see which service currently holds the rights. Sign up for that service’s free trial, watch the movie (2 hours and 18 minutes), and cancel before the trial ends. This is 100% legal and costs you nothing but a reminder on your phone.
Then, he delivers the line that redefines the entire movie: shutter island for free
Just remember: once you enter the lighthouse, nothing is ever the same. Unraveling the Mysteries of Shutter Island The Architecture