The early Queen novels were characterized by intricately plotted clues and solutions. In "The Greek Coffin Mystery" (1932), "The Siamese Twin Mystery", and others, multiple solutions to the mystery are proposed, a feature that also showed up in later books such as "Double, Double" and "Ten Days' Wonder". Queen's "false solution, followed by the truth" became a hallmark of the canon. Another stylistic element in many early books (notably "The Dutch Shoe Mystery", "The French Powder Mystery" and "Halfway House") is Ellery's method of creating a list of attributes (the murderer is male, the murderer smokes a pipe, etc.). Then, by comparing each suspect to these attributes, he reduces the list of suspects to a single name, often an unlikely one.