'Sherlock Holmes and Dr Watson investigate the disappearance of champion racehorse, Silver Blaze, which vanished in the middle of the night from its stables. Owner Colonel Ross is desperate to get his prize possession back. He recalls that there had been some strange comings and goings the night the horse disappeared. When the horse's trainer, John Straker, is found dead, it becomes a murder investigation...
Approximate running time: 68 minutes.'

A one CD freebie audiobook from the Telegraph in 2011, from AudioGo, the relaunched BBC Audiobook division. Given to me by a colleague who knows I'm a Holmes and Watson fan :)