Maurice Leblanc's 'The Golden Triangle: The Return of Arsène Lupin' is a thrilling detective novel that follows the famous gentleman thief, Arsène Lupin, as he embarks on a new adventure. Written in Leblanc's trademark style of clever twists and turns, the book is a masterpiece of early 20th-century French literature, blending elements of mystery, suspense, and romance seamlessly. Set in the literary context of the Belle Époque, Leblanc's work stands out as a prime example of the genre of 'roman policier,' or detective fiction, captivating readers with its intricate plot and charismatic characters. Fans of classic detective stories will be delighted by the intricate puzzles and daring exploits that Lupin undertakes in this captivating narrative.