Riddled With Clues

A hospitalized friend gives a puzzling note to Sara Almquist.He received the note signed "Red from Udon Thani" while investigating the movement of drugs from Cuba into the U.S. However, he doesn't know anyone called Red, and the last time he was in Udon Thani was during the Vietnam War. After Sara listens to his rambling tales of all the possibilities, both are attacked. He is left comatose. As she struggles to survive, she questions who to trust: the local cops, her absent boyfriend, the FBI, or a homeless veteran, who leaves puzzling riddles as clues.