By Carlo Lucarelli, dramatised by Judith Adams.
Simon is a blind man with synaesthesia, a condition which enables him to hear sounds in colour. A keen radio hack, he spends his days listening into other people's business. Two voices set him on a trail which takes him out of the security of his room into the outside world.
Anna/Mrs Martelli....Monica Gibb
Victor/Lab technician....Simon Tait