Joy Fielding 
Deep End 

Joanne Hunter’s secure suburban world is falling apart. Her husband’s desertion after twenty years of marriage leaves her stunned. Eve, her best friend, is strangely distant. Her grandfather, who has been a pillar of strength and support, lies ill and helpless in a nursing home. Lana and Robin, her teenage daughters, claim every ounce of her energy and devotion and all the love she feels she has lost.Only one person seems to care — a stranger with a rasping voice, a tormentor with a vicious mind. Danger and despair close in with each ring of the telephone. Each deadly message lures her inexorably towards the deep end From the Paperback edition.