A new musical director for the bell-ringers of St Marys leads to discord, disharmony and the blood-curdling sound of murder.

Luther’s date with Mary, and the promise of romance, is interrupted by the news of another murder. The killer has struck again – the number of victims is escalating fast.

Lucas’s past comes back to haunt him when his former torturer Darshavin turns up with intelligence about a bomb in London. Harry fears Darshavin still has a psychological hold over…