A Dorothy L. Sayers Mystery - All Seasons

The crime novelist Harriet Vane is on trial for the murder by poisoning of her former lover Philip Boyes. Lord Peter Wimsey is convinced of her innocence and falls in love with her. After the jury fails to reach a verdict, Lord Peter has 30 days until her retrial to investigate, and proposes marriage to Harriet should he save her. 

Having been cleared of murder, Harriet Vane holidays in the West Country, only to find a recently-murdered body on a rock on a deserted beach. Before she can summon help, the corpse is washed away by the tide. Together with Lord Peter Wimsey she investigates and discovers a complex plot involving a wealthy widow and a gigolo who believes he is a member of the Russian aristocracy.

With some trepidation, Harriet Vane attends a reunion "gaudy" dinner at her old Oxford college, where she is welcomed by the dons, but suspects they are mostly interested in her association with Lord Peter Wimsey. A series of poison pen letters, acts of vandalism and other unpleasant events begins to plague the college and threaten the hard-won reputation of women at the university.