The French Powder Mystery is the second novel by Ellery Queen, the celebrated duo who redefined detective fiction with their ingenious puzzles and intellectual challenges. First published in 1930, this mystery captures the Golden Age of detective fiction with its intricate plotting, fair-play clues, and a shocking revelation. The story begins when a glamorous New York department store stages its daily window display—only for horrified onlookers to discover the body of the owner's wife hidden among the furniture. Inspector Richard Queen and his brilliant son Ellery are called to investigate, confronting a case full of secrets, lies, and carefully concealed motives. As the Queens delve deeper into the lives of the suspects—family members, employees, and business associates—they uncover a tangled web of jealousy, ambition, and betrayal. Each new clue points in a different direction, leading to a series of surprising twists that challenge both the detectives and the reader. Ellery Queen's signature style shines in this novel: the logical unraveling of clues, the classic "Challenge to the Reader" before the solution, and the clever interplay between father and son as they pursue justice. It is a masterclass in detective fiction construction.