The Bourne Identity by Robert Ludlum

The film version of this followed the beginning of the book very closely.  But the book devolves into constant angst on the part of the title character. The story itself follows closely in both mediums.  A man falls overboard, fighting for his life.  He’s picked-up by fishermen, who take him to shore on a small isle, where he is nursed back to health by an alcoholic doctor.  But he is an amnesiac.  He had something embedded under his skin.  He remembers something about a bank.  Once he goes there, he becomes a target.  He abducts a woman as a shield to get away, but then when he leaves her, someone tries to rape and kill her.  He returns and saves her only to faint.  When he awakes, she is taking care of him.  In the meantime, his arch enemy, whom he does not remember, attacks the secret headquarters where Bourne got his instructions to trap or kill, and leaves Bourne’s fingerprints.