Shutter Island is a thriller written in 2003 by Dennis Lehane. Set in the summer of 1954, with experiences of World War Two still fresh, the novel follows U.S. Marshal Teddy Daniels as he travels to Shutter Island, location of Ashecliffe Hospital for the Criminally Insane. Assigned a new partner, Chuck Aule, Teddy is ostensibly investigating the disappearance of a patient, but is also investigating rumors of Ashecliffe's use of controversial radical treatments. The book has an intriguing and exceptionally intricate plot and the reader is confronted by two equally plausible conclusions at the end.
Shutter Island deals in depth with different psychiatric conditions and disorders, including pure psychopathy, delusions and bipolar disorder. In order to write the novel, Lehane researched psychiatry and mental illness in depth and credits three books in particular for his research - "Mad In Anerica" by Robert Whittaker, "Gracefully Insane" by Alex Beam and "Boston Harbor Islands" by Emiky and David Kale.
Dennis Lehane is the author of more than eight bestselling novels including New York Times Bestseller Gone,Baby, Gone. The majority of his books are set in the Boston area, where Lehane lives, having grown up in Dorchester, Massachusetts. "Shutter Island" is the third of his novels to be made into movies, and was a critical success starring Leonardo DiCaprio as Teddy.