Arranging an engagement to the infuriating Captain Harry Cathcart in order to escape her extradition to India, Lady Rose Summer finds the agreement complicated by a friend's untimely demise, a murder Rose's intended helps her to investigate.
Seeking her independence, Lady Rose Summer leaves her parents' home to join the working class, but when an acquaintance turns up dead, Captain Harry Cathcart and Superintendent Kerridge of Scotland Yard enlist her aid.