A Deadly Deception by Margaret Thompson Davis

A Glasgow pensioner, Mabel Smith, needs some extra money so decides to work for an adult chat line. No one will ever find out and it is the solution to her money problems. One of her regular 'clients' John, thinks he has fallen in love with her and is desperate to meet her in the flesh. Unfortunately Mable hasn't been honest about her looks; what she has done is describe her lovely young neighbour Cheryl with the blond hair and trim figure instead. Mable keeps giving excuses as to why they can never meet so John becomes obsessed with finding this elusive woman of his dreams; he carefully combs sections of the area where he suspects she lives as the anger builds up in him with terrible consequences.

An enjoyable fast-paced thriller, easily believable in this age of chat-lines.