"Number Seventeen" by Louis Tracy is a captivating detective novel that immerses readers in a world of mystery and suspense. Renowned for his skillful storytelling, Tracy crafts a tale that keeps readers guessing until the very end. The genre of this book is mystery and detective fiction, characterized by its intricate plot and engaging narrative. The story is set in early 20th-century London and revolves around a seemingly ordinary house, Number Seventeen, which becomes the focal point of a complex web of secrets and criminal activities. The novel begins with a dramatic and puzzling incident that sets the stage for a series of investigations led by Tracy's astute and resourceful protagonists. These characters navigate through a labyrinth of clues, red herrings, and unexpected twists, showcasing Tracy's talent for building suspense and maintaining a fast-paced storyline. What sets "Number Seventeen" apart is Tracy's meticulous attention to detail and his ability to create a vividly atmospheric setting. His characters are well-drawn and relatable, adding depth to the narrative. Tracy's deft handling of the plot and his knack for creating tension make "Number Seventeen" a standout work in the detective fiction genre.