Book excerpt: This carefully edited collection of mystery novels has been designed and formatted to the highest digital standards and adjusted for readability on all devices. Isabel Egenton Ostrander (1883–1924) was a British mystery writer of the early twentieth century who used, besides her own name, the pseudonyms Robert Orr Chipperfield, David Fox, and Douglas Grant. In 1920s she was notable enough to be parodied by Agatha Christie in Partners in Crime, a Tommy and Tuppence mystery that parodies many of Christie's idols. Content: One Thirty The Crevice Island of Intrigue Anything Once The Fifth Ace