Shock Treatment — James Hadley Chase

A TV salesman, Peter Regan, falls in love with Gilda Delaney, the wife of a wheelchair bound bully. She had never stopped blaming herself for the accident that crippled her husband. At least, that was the story she told him - a story he had no reason to doubt, infatuated as he was with everything about her. Peter therefore decides to murder the bully with an ingenious plan using a TV set as the murder weapon. It was only afterwards that he began to wonder....