Detailed Instructions: You will be given a context, a subject and a relation. Your task is to generate a question based on the subject and relation. The generated question should include the given subject. Try to use a minimum number of words that are not present in either context, subject or relation while generating question.
Problem:Context : It is to revel in such writing that I return time and again to Stout's books, and in particular to The League of Frightened Men, Some Buried Caesar, The Silent Speaker, Too Many Women, Murder by the Book, Before Midnight, Plot It Yourself, Too Many Clients, The Doorbell Rang, and Death of a Doxy, which are for me the best of all the full-length Wolfe novels. 
Subject : Death of a Doxy 
Relation : series
Solution:
Which series is Death of a Doxy apart of?