Percy James Brebner's Brown Mask is a gripping novel that tells the story of a mysterious figure hiding behind a brown mask. The hero of the book, known only as "Brown Mask", carries out a series of daring thefts in the elite areas of London, leaving behind only mysterious traces. Will the detective who decided to solve this case be able to solve the mystery of the identity of "Brown Mask" and stop his criminal activities? This novel is full of intrigue, unexpected plot twists and an unpredictable ending that will keep the reader in suspense until the last page.