Mrs. Thistlethwaite and a Shadow of Doubt: A Tillamook Tillie Mystery

Has old age finally caught up with Mrs. Thistlethwaite's remarkable memory? When Tillie finds a murder victim at the bus stop, she calls her friend, Detective Ransom, but when he arrives Tillie is unconscious and there is no body. Has she had a stroke? Is she imagining things? Or is a killer getting away with his crime?