Arthur Gask's 'The Hidden Door' is a captivating mystery novel that takes readers on a thrilling journey through the deceptive labyrinth of human psychology and the intricacies of criminal behavior. Set in the early 20th century, the book is a classic example of Golden Age detective fiction, featuring a clever amateur detective who unravels a web of secrets and lies to solve a perplexing murder case. Gask's literary style is marked by its meticulous attention to detail and its ability to keep readers on the edge of their seats with unexpected plot twists and turns. The atmospheric setting and nuanced character development make 'The Hidden Door' a compelling and engaging read for fans of the genre. Arthur Gask, a British mystery writer, drew inspiration from his background in medicine and psychology to craft a story that challenges readers to think critically and unravel the mysteries hidden within the human mind. His unique perspective and insightful observations add depth and complexity to the narrative, making 'The Hidden Door' a standout work in the realm of detective fiction. I highly recommend this book to anyone who enjoys a good mystery and appreciates well-crafted storytelling that delves into the darker aspects of human nature.