The Girl in the Plain Brown Wrapper

Travis McGee, the self-proclaimed salvage expert who specializes in getting back money and goods taken through scams, returns after spending weeks out on his boat and finds a letter from Helena, a woman he had helped years before and had a brief romance with. Helena is dying and asks Travis to check on her daughter Maureen who has gone completely nuts. Travis learns that Helena died before he got the letter, and even though he doubts there is anything he can do, he travels to see Maureen who is being cared for by her husband and sister.