Accountant Leonard Dunbar's Monday appointment shows up right on time, 4:15 PM. She is Helen Desareé, who's dressed and looks fit to kill. She asks Dunbar to go through her recently-deceased mother's papers and arrange for the transfer of any and all assets to herself, the sole beneficiary. Helen returns on Wednesday at 4:15 PM for a progress report and again on Friday, same time, to sign whatever is necessary. During the week, Dunbar makes an extraordinary discovery about the death of Alice Des...