Could a mysterious music box hold the key to unlocking the puzzle behind a gruesome murder for Detective Inspector Silas Quinn? London, 1914. Despite a number of setbacks, rehearsals for The Hampstead Voices' Christmas concert are continuing apace. The sold-out event is raising funds for war refugees, and both Winston Churchill and Edward Elgar are expected to attend. But the most disturbing setback of all occurs when the choirmaster, Sir Aidan Fonthill, is discovered dead at a piano, a...