The second
Lord Peter Wimsey novel in which
Harriet Vane appears is the 1932
Have His Carcase whose title is taken from an old legal writ. Harriet goes off on a hiking trip along the seashore, after being acquitted of murder charges in
Strong Poison, and discovers the body of a man with his throat recently cut. She calls in Lord Peter -- played by
Edward Petherbridge[?] in the movie based on the book by
Dorothy L. Sayers -- to help her deal with the press as well as the police, and together they solve the crime. Meanwhile, he keeps taking every likely opportunity to ask her to marry him, and she keeps refusing, as much because she mistrusts her own feelings as because she doubts his.
