<p>Phyllis Ewans, a prominent researcher in Lepidoptera and a keen walker, has died of old age. Thomas, a much younger fellow researcher of moths first met Phyllis when he was a child. He became her carer and companion, having rekindled her acquaintance in later life.<br>Increasingly possessed by thoughts that he somehow actually is Phyllis Ewans, and unable to rid himself of the feeling that she is haunting him, Thomas must discover her secrets ...