How many R S Allersons can there be in Sydney? More to the point, how many gang bosses named R S Allersons? The master mystery-story teller Aidan de Brune presents another breathtaking novel „"The Unlawful Adventure"”, written in 1932. It is a highly entertaining little thriller with absorbing interest and complicated plot. The characters are broadly drawn but vivid, the plot movers along at a breakneck pace, and it’s rather luridly sensationalistic for its era. The book is highly recommended for people who like to treat a mystery story as a solvable riddle.