Off the Record by Dolores Gordon-Smith

The new entry in the popular 'Jack Haldean' series, set in the Roaring Twenties  -  Charles Otterbourne's New Century company should have been the perfect partner for Professor Alan Carrington's radical new gramophone. After all, Charles was not only a leading manufacturer, but also a noted philanthropist. But when murder is the result of their meeting, Jack Haldean takes up the case, in a desperate bid to save a man from the gallows. But what led to the crime? The answer is Off the Record . . .