CONFRONTED As we are by counsellors at even turn. we can hardly escape knowing that the proLess of bereavement takes a recognised course - denial, anger, then acceptance. What happens, however, to those who never move beyond the denial stage? Are they perhaps better off?The non-acceptance of loss is the main theme of Jennifer ~ohnston's marvellous novel. In the early 1970s Imogen Bailey, aged eighteen, is in a nursing home near Dublin recovering from a breakdown, when her father brings her the news that her older brother 0 Johnny has drowned at