Clouds of Witness

The Duke of Denver, accused of murder, stands trial for his life in the House of Lords. Naturally, his brother Lord Peter Wimsey is investigating the crime - this is a family affair. The murder took place at the duke's shooting lodge and Lord Peter's sister was engaged to marry the dead man.

But why does the duke refuse to co-operate with the investigation? Can he really be guilty, or is he covering up for someone?