"Clouds of Witness" is the second book of Dorothy L. Sayer's immensely popular Lord Peter Wimsey mystery series (which runs to an astonishing fifteen books).

This entry - published in 1926 - begins when Lord Peter's brother, the Duke of Denver, is accused of murdering Captain Denis Cathcart, who was engaged to their sister, Lady Mary. Despite damning circumstantial evidence, the Duke refuses to provide an alibi, appearing to protect a secret. Lord Peter investigates to clear his brother's name before the trial in the House of Lords.

Stuffed with Sayers' particular brand of quirky humor and fast-paced adventure, "Clouds of Witness" is among the most popular books of the beloved Lord Peter Wimsey mystery series.